DUE DATE

[alt123]

so i have never kept track of my LMP but i do remember having sex with my ex on oct 14 and with someone else in november due do the fact that i cant remember my last lmp the doctor gave me the due date of august 20 how acurate our sonagrams with due dates by size of baby?

[alt123]

I know it was sometime in nov so no way it coild be oct?

[AnnieBrooke]

If you had a 12th-week ultrasound, it will be reliable to within a few days, maybe +/- 6 days if that much.  Your estimated ovulation date would be around November 21, with a conception window (because of the margin for error) of the 16th or so through the 25th of November.  We are definitely not talking about anything in October.  I can't help you further than that because you didn't say when you had sex in November, but it is clear that the sex in October did not produce the pregnancy.

[alt123]

It was jan 29 just ending my 1st trimester

[AnnieBrooke]

Your earliest ultrasound was at what point in the pregnancy, i.e., what week (like, 10 weeks 3 days or whatever)?

[alt123]

Thank you annie!!! the earliest ultra sound i received gave me a due date of august 14 my new doctor moved it to august 20 due to  the size of baby and that was mid feb does that help?>

[AnnieBrooke]

Early ultrasounds can be pretty accurate, almost to the day.  By the end of the pregnancy there is a margin for error of many days.  When the doctor gave you the due date of August 20, how far along did he say you were (i.e., 6 weeks, 7 weeks, etc.)?   If the ultrasound was early, like at least in your first trimester, it is reliable enough to indicate that you conceived in late November.  I can't see it being your ex from October 14 in any case, that would be way too early even if the ultrasound was off by two weeks.