Expert: Dorothy H, LCCE - 5/31/2011

Question
QUESTION: hi so im trying to see if i got pregnant in october or nov? i was having sex with someone in october i know the month of october i got my period i believe i just couldnt remember which day so then in november i started having sex with another guy but the same dude all of novemeber my period didnt come at all so when i went in for an ultrasound i gave them what i thought my lmp was october 30 they told me i was 11weeks and 3days..... then i went in for another ultrasound about a week later and told them i didnt remember my lmp and they told me i was 13wks and 5 days so when i counted that back on the calendar it put me around october 24 or 25th so does that mean i conceived in october or is that around when my lmp was and i did forsure conceive in november please help one of my due dates was aug 5th 2011 the other was july 31,2011 i just wanna kno how did the ultrasound date me and if i should be worried i just wanna know if i conceived in novemeber or october please help

ANSWER: Both ultrasounds place conception sometime in November - with the July 31 due date, it puts conception around November 7 and with the August 5 due date it places conception around November 12.  In either case, it is placing conception solidly in November, not October.

I hope that helps!

Sincerely,

---------- FOLLOW-UP ----------

QUESTION: Okay so basically i shouldnt worry about tellin the guy in oct its his baby? and also how can an ultrasound date you off your lmp if you dont know it and do you still take off two weeks to get  possible conception if you dnt member your lmp or no

Answer
The ultrasounds are both placing conception in November, so you don't need to worry about the October guy.

With the ultrasound, they base it off of how developed the baby is, which is very consistent for the 1st trimester.  When calculating how many weeks you are though, they go back two weeks from when they feel conception occurred; for example, when they told you that you were 13 weeks 5 days, it was actually more like 11 weeks 5 days since you got pregnant.  I agree that it is confusing!  And that is confirmed by the due dates that they gave you.

I hope that clears things up!