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im unsure of the first day of my last period.. but i know it was somewhere around june 25th 2007. ive always had a shorter period (lasted about 4 days) i think i got pregnant in the begining of july because thats what i was told at first. i had an ultra sound on november 9th 2007 and it said i was 18 weeks, 4 days . would i count back 18 weeks and 4 days from that date to figure out when i got pregnant?? another thing.. i was going through a break up with my boyfriend at the time.. and had been sleeping with another kid from the end of june (right before my period) all along.. but i did have s_x with my ex 2 times during july 7th to the 21st.. whos the father....??