Could you explain how it would be a possibility at all? Hello, All the things are against conception from January 18th.
Could the birth control not have worked in Jan, the embryo lived through the withdrawal bleeding, and the fetus has continued to measure small throughout the pregnancy? According to this period date, the most likely date of conception would be around 14 days after the period, that is around the 19th of February.Ultrasound has intrinsic error of upto maximum 5 - 7 days, so the probable dates of sex would have been a week before or after the 19th of February, but in NO WAY as early as January 18th.Also, you had a condom as protection, took Plan B, and then were on probable birth control too - so chances of conception are nil.If the embryo had lived through the withdrawal bleeding, and then measured small in the first abdominal scan, subsequent scans at 11 weeks, 14 weeks etc would have definitely picked up the discrepancy.Hope this helps, please feel free to discuss further. I read so much about that on that internet & it concerns me.
Also if for some reason I deliver early would that mean that my conception date was off and that I did possibly conceive in January? I have just been worried about this all pregnancy and would like to put it behind me. Hi, When taken within 72 hours, Plan B is still 90 % effective in preventing a pregnancy, plus condom was used.
I would like to know the accuracy of ultrasounds in the first trimester. On Feb 2 I went off birth control for good & had withdrawal bleed on Feb 5-8.
He used a condom, I believe I was on birth control (but cant remember for sure), and took Plan B 55 hours later.
If it is a single measurement, it would be less accurate but still within a 4-5 day margin.
As always, depends on the skill of the ultrasonographer. Read more First trimester us is usually considered to be accurate within a week, or /- 3-4 days.
I had an ultrasound on 4/26 that dated me 11wks, 2d CRL 45mm with EDD 11/12.