Accuracy of ultrasounds for dating

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.ALL the remaining scans continued to be one month off the mark (least likely)This is the only situation , and it is impossible.

accuracy of ultrasounds for dating-46

You had ultrasound pretty frequently, so that possibility can be ruled out.

Please do not worry, as I strongly opine that you DID NOT conceive from the January 18th episode. I have just been concerned because I did not take Plan B until 55 hours after the encounter. Also is it possible that the withdrawal bleeding was implantation bleeding?

Other ultrasounds at 19, 21, and 27 weeks all gave EDD of 11/12. Totally 6 ultrasounds have all given you the same EDD - 11/12.

Given this information, would it be possible that all of my ultrasounds were a month off and I conceived Jan 18? Based on this EDD, the last date of your period would have been 5th of February.

Regards Thank you so much for your detailed responses.