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Pregnancy Conception Timeline: Calculating Possible Conception Date


Question
Hi i was wondering if i had my period march10 and then it came again april 12 dat makes it a 32-33 day cycle..rite...
and if i found out in may i was pregnant that means i conceived around april... which day would it had been more possible that i concieved...if i had sex on 04/21 around 1-2am and on 04/30 around 1-2 am but did it more than once this nite even the next morning...

I went for my ultrasound when i was 24 weeks 4 days and the tech said i was 24wks 5 days but that puts it at a day before i came on my period..and i wasnt having sex at all at the begining of april so it left me confused on when i conceived..SO THE u/s was no HELP at all..

Im now 33weeks 1 day if you go by my lmp...and i am having a boy...
Can anyone give me some imput...
im PRAYING to our lord i conceived around april 30th..

one more thing i was spotting the morning of may 10 or 11th it was one of those two days... and had no period...so i kinda figured i was pregnant..

Answer
Hello,

There are a few things to address here. Your previous 2 normal periods does put it at 32 day cycle but I am assuming all your previous menstrual cycles fall around that same length.  If this is the case, then a woman with a 32 day cycle would typically ovulate (release the egg) on day 18.  When I look at my pregnancy wheel it shows day 18 being April 30th.  

Ultrasound measurements are never assumed to be exact, although that is what we strive for.  It is very operator dependent, meaning I could have walked in right after the girl who scanned you at 24 weeks 5 days and get a little different result.  Also, the age from the ultrasound takes into account your last period; it does not go by the conception date.  To have your first ultrasound later in the second trimester is not as accurate for dating purposes compared to a first trimester ultrasound.  An exact date of conception is not possible to know, although by your limited menstrual history you gave me does show you ovulated on April 30th.

A paternity test will be the only way to know 100%.

Take Care