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Bare with me please. 

I am officially 21 yay (today's my bday)

Myhusband and I use the "pull out" method and sometimes he just does "his stuff" inside me.If we get pregnant yay! If we dont yay... we dont mind either or... My last period was july 31st ended Aug 4. Normal cycle. My next AF was suppose to be around august 27 (my AF usually comes either  up to 3days before or after the date i get from my app) Well i missed it! I took 3 HPTs all negative! So went to the dr got a blood test also negative! :( Almost the whole month of august I was cramping and a few days before AF was due I kept feeling as if it would come so I would run to the restroom and NOTHING! My cramping stopped  literally 3 days ago. I have been having headaches and I m normal tired by the end of the day so Isleep  WAY earlier than I would normal fall asleep and this week i got sick; Sneezing all the time, nostrils clogged up, etc... Other than that I feel normal.. I feel the same way i always have! the dr gave me pills to get AF to come down but my mom says I should wait a couple more days just in case I am pregnant. Any one ever experienced this?  I want to go out and drink but i am afraid i am pregnant! Im so confused!!! I am under no stress, My diet is the same and everything in my life is the same as it always has been so I honestly dont umdrrstand! Help me please?!!! Can i be pregnant?  Can something else be wrong? Anything will help at this time! 

(Ps: The dr i went to was just a random clinic because i dont have my own dr; so they dont have anything of mybackground or any of my medical history. They really just know my blood pressure and my weight lol)