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Doctors use your last period for dating i.e saying you are 8 weeks. So yes, you actually conceived about 2 weeks after your lmp which should be the Sept 2nd you are stating. Make sense?

I am very confused about this because I got married on Augest 31 of this year my hsband drove in on the 27 we only had s_x from the 27 to the 1 of september I am due June 9 I am 7 weeks pregnant but they said they think my conception date was around sep 16 which is possible because I have NEVER cheated on my husband but for it to be sep 16 that means I would have had to which is bull c___p..

Kayla, when you get your u/s they always put two weeks on top of it. the u/s specialist said i was 7w2d pregnant which means i got pregnant around the third day of my period which is b/s because, first of i do not have s_x when i am on my period. but then i read this an article by the doctor Jane Foley(you can google her) where she explains the dating of pregnancy and the "missing 2 weeks". So really, when they say you're 7 weeks, you're actually 5 weeks ;) congratulations!

augustmommy3 hi, so was the ultrasound correct? i had an u/s done on Feb.21, saying i was 12wks and said my conception date was the 29 of Nov. the second day of my cycle. is thats possible? i had s_x on the 10 of dec. My due date is Sept.4, 2012...but it dont add up to me? so is the u/s wrong?

Sarah, your post is already answered in this thread. By convention "weeks pregnant" is given from the first day of your last period. In fact you did not conceive until ovulation two weeks later.

I got it .It's pretty easy to understand. Thanks.

My ex girlfriend is 31 weeks today her due date is June 12,2017,that's about all I know we argue so were not talking right now 

Trying to figure a conception date?