QuestionHello, I've been going crazy trying to figure out/calculate these dates.
I had unprotected sex on 11/25 ... I believe i had a period around the 20th of december, but I'm scared I'm getting confused with implantation bleeding. I also had unprotected sex on 12/16, 12/27, 12/29 1/2 and 1/5, and a lot more days after that. I found out I was pregnant in February. and had a transvaginal ultrasound on February 22, 2011 leaving me at 9 weeks and 1 days. My EDD is September 26, 2011. I need to know if it is at all possible that I conceived from 11/25 making implantation occur on 12/20?
Thank You!
AnswerHello Arline,
No, it's impossible. Early transvaginal ultrasound between 8-10 week gestation is the most accurate way to date a pregnancy with a standard error of measure of +/- 1 day. This means that your ultrasound measurements are very accurate, making it impossible for you to have conceived in December. Rather, you most likely conceived around January 3rd and your estimated due date is accurate at September 26. You can verify your dates at http://www.givingbirthnaturally.com/calculating-due-date.html as well.
Best,
Catherine Beier MS CBE
www.GivingBirthNaturally.com
