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somewhere around july 9th.......

Conception Date 07/13/06 EDD 04/05/07 EFA(estimated fetal age) 20weeks 5days Congratulations!

Hi santana, You're due April 1st? You should be due April 5th. I know b/c I've counted it numerous times as that is the date of my last period and I'm due April 5th. --I conceived between July 10 and 12th (which is just short of 14 days after the 1st day of last period). I know I conceived in between these dates b/c my dh and I use Natural Family Planning so I know when I was ovulating. (Your due date by the way is 40 weeks after your last period so are you counting from the 1st day of your last period? b/c if the 29th of June was the 1st day and was a Thursday then you should be due on a Thursday 40 w later = April 5th. Also if you add 7 days to the first day of your last period and minus 3 months you should get your due date which again = April 5th).

i just would like to say that if she had an ultrasound which she probebly did, then you go by what the tech says for a due date as they can see the babies age. regardless of the lpm it dosnt matter. since she got a due date of april 1st, you calculate backwards from that for a conception. it just means she didnt ovulatie on the typical by the book days just as most women dont. if i go by my lmp, im due march 24th but teck said nope, due march 19th. Like i said it dosnt matter on the period, it matters when you conceived.

Yeah, I know they go off of u/s dates, which are more accurate then IMP dates IF there is a big difference in the two dates. For a few day difference between the IMP and the u/s date they don't generally change your due date though b/c u/s can be off by as much as a pound when an experienced tech performs it –can be off by more if they aren’t experienced. U/s aren't exact enough for the date to be chanced if there is only a few day difference between the IMP and the u/s. Normally, there needs to be a large difference like a week or two for them to consider changing it. So a 4 day difference of April 1 to 5th; most doctors wouldn’t change it for that little of a difference. –Not saying her’s didn’t but most wouldn’t. Also just wondering you said the tech told you a different date; did your doc too? B/c to actually change your due date the doc has to be the one to decide to change it not the tech. –The tech is just going off of the estimates that the u/s gave him/her on the computer, the doc has to be the one to actually decide if the difference is relevant. I've known more then one person who has had their u/s show a different date (some by a lot) and the doc doesn't change it. Currently I know a person who had 2 u/s and the one showed a due date of the 15th of this month and the other showed a due date of the 27th so the u/s results really can depend partially on how experienced the tech is and the babies growth rate at a specific pt in time. If the doc changes your date great, but if the tech just say that according to the u/s the due date is 'such and such' that doesn't mean that you're doc is going to say you're due the date the u/s gave -especially if there is only a little bit of difference between the dates.

Maybe its different where you live. but the reason the doc sends you to the u/s for a date check is to get a more accurate date. most doctors will go my the due date a tech gives, thats part of the reasons you go to an early u/s. Doctor's give you their due date based on their cardboard wheel and your period. they dont know when you ovulate for the most part as everyone is different. Im not arguing with you over this becuase your area is alot different than the areas ive lived in. but the reason i did the above post is becuase of your first post. Your telling her basically the way it is in your area, she isnt due the 1st but the 5th, i basically said why her dates got changed. Its not a big deal to have a changed date even if it is just by a couple of days. and too say most doctors wouldnt change dates is a little extreem, as you dont know her doctor from your doctor, its a personal option on each doctor individualy to change the date

Conception was around 07/09/06 So that would make you about 22.5 weeks pregnant. Congratulations!

tyler0323, by no means was I trying to say that she couldn’t be due the 1st (if her doc said she is I’m not arguing it), although I can certainly see how what I wrote sounded like I was saying that it couldn’t be the 1st. I brought it up b/c I’ve seen a lot of women on here who are confused on due dates and such –some even after talking to their doc. Also a lot of women have posted the date of their last period w/o realizing that the IMP date starts from the 1st day of the last period (I’ve seen ppl who thought it was the last day of their period instead) so that is where my post came from. As far as area goes I’ve been a few places in the US, so while things may vary from areas, I still feel pretty confident in some of what I said (at lest here in the states). You are right that early u/s are done to determine dates, and they are more accurate then u/s done after the 1st trimester, however they still have a margin of error of + or - 5 days, so ‘most’ doc that I’ve heard of (and I looked this up after your last post to double check that I hadn’t just made it up in my head. LOL -sometimes I’m good at thinking I know something and then realize that I have no idea where my “fact” came from…LOL), or have known don’t change due dates that aren’t off by at lest a week or so (early u/s). U/s done later have errors of a lot more. I’m not saying that your doc or Santana doc couldn’t have changed the date, ppl do ovulate early sometimes (I know personally that this can happen as dh and I use Natural Family Planning for birth-control and to conceive and so I have to know every cycle approximately when I’m O’ing and occasionally it's early/late), I’m just saying that a few days difference on an u/s isn’t much, b/c u/s's have a large margin of error. Here is and excert from one of the articles that I found when I re-looked into this to double check myself it’s pretty straight forward and I thought did a good job at explaining u/s and due dates: “…Unfortunately , people tend to give a lot more credibility to ultrasound due dates than is warranted. That is, many people a__sume that if an ultrasound due date is different from their due date based on a last menstrual period, that the ultrasound date is more accurate. However, this isn't necessarily true. Remember that the basic a__sumption behind an ultrasound due date is that a given measurement corresponds to a given gestation. To put this into the proper perspective, imagine that you're told to figure out when a young child will turn 10 years old and are given the following tools: a tape measure and a pediatrician's growth chart for children…Only the most gullible individuals would be willing to believe that they can actually predict when a young child will turn age 10 with any degree of accuracy using a tape measure and a growth chart. The reason for this is fairly obvious. If you lined a dozen five-year-olds against a wall, they would not all be the same height, even if they all had the same date of birth. Five-year-olds come in many different heights because children grow at different rates. This is called normal biological variation. This normal biological variation introduces a potential for error to the tape measure method for calculating when a young child will turn age 10 because a particular child might be taller or shorter than average….Like older children, babies in the uterus also grow at different rates. Since ultrasound due dates are based on averages, all ultrasound due dates have a built-in potential for error because a particular baby might be larger or smaller than average. The amount of possible error depends on the amount of biological variation. The greater the biological variation, the greater the potential for error. It turns out that babies in the uterus have the least amount of biological variation in early pregnancy and the greatest amount of biological variation in late pregnancy. Therefore, the amount of potential error in an ultrasound due date is smallest in early pregnancy and greatest in late pregnancy. In fact, an ultrasound due date based on a crown-rump length obtained at less than 10 weeks gestation has a built-in error of ± 5 days. On the other end of the scale, the range of error for an ultrasound due date based on a combination of 4 different measurements obtained at 36 weeks gestation is ± 21 days!! The statistical term for the built-in error of an ultrasound due date is it's "Standard Error of Mean,"…It only makes sense to change a due date to an ultrasound due date if the difference between the due date based on a last menstrual period and the ultrasound due date exceeds the built-in error for the ultrasound due date. Many care providers use the "7-14-21" rule for changing a due date based on a last menstrual period to an ultrasound due date. The 7-14-21 rule means that you change the due date to the ultrasound date only if the difference between the ultrasound date and due date based on a last menstrual period is more than 7 days for first trimester ultrasounds, 14 days for second trimester ultrasounds and 21 days for third trimester ultrasounds. A trimester is about one-third of a pregnancy, or about 13 weeks. In close cases, care providers are more inclined to accept the ultrasound date if the last menstrual period is unreliable…The real "take home" message is do not a__sume that our due date has been changed just because an ultrasound comes up with a different due date! Most care providers will only change a due date to an ultrasound due date if there is a "significant" difference between a due date based on a last menstrual period and the ultrasound-based due date, or if the last menstrual period is less reliable than the ultrasound date. A "significant" difference between a due date based on a last menstrual period and an ultrasound-based due date is a difference that exceeds the "Standard Error of Mean," or built-in error for the ultrasound date. ---David L. Kutzler, CNM, MS Certified Nurse-Midwife From the ‘American Pregnancy a__sociation’ website: Q) "How accurate are ultrasounds in calculating gestational age? A) Your healthcare provider will use hormone levels in your blood, the date of your last menstrual period and, in some cases, results from an ultrasound to generate an estimated gestational age. However, variations in each woman's cycle and each pregnancy may hinder the accuracy of the gestational age calculation. If your healthcare provider uses an ultrasound to get an estimated delivery date to base the timing of your prenatal care, the original estimated gestational age will not be changed. Q) How accurate are ultrasounds in determining the conception date to determine paternity? A) ...Ultrasound dating of conception is not reliable for determining paternity because the ultrasound can be off by at least 5-7 days in early pregnancy." Anyways, I’m not trying to be a jerk, a know-it-all, or to argue with you here b/c you may very well be right to that some areas and doctors vary in how they handle things such as due dates. I'm just trying explaining where I was coming from and to provide some actual facts to prove that I didn't just randomly make it all up. :0 ) Hope that helps explain myself some. Have a wonderful day. ~Sarah

Hey!!! Im new to this site and Im trying to figure out the EXACT same thing, my last period was Aug 31..(first day)and Im due June 7th?!?!?!HELP me please lol.

Yummymummy, June 7th sounds like the typical 40 week due date. a__suming your cycle is normally about 28 days long you probably got pregnant around the 13th (plus or minus a day or two) of September. If you’re cycle is longer then 28 days count backwards by about 13 days from the day your next period would have been due. Almost always women ovulate about 13 days prior to their period arriving (normally get your period about the 14th day after ovulation). This can vary by a day or two (plus or minus), but is almost always set around 13 days for all women (when a cycle changes and is longer or shorter it is generally due to the fact that the days leading up to ovulation were longer or shorter. The days after ovulation almost always remain around that same 13 day length, + or – a couple days).