How Can Conception Date Be Determined After Getting Pregnant?

Posted on Mon, 30 Dec 2013

Medically reviewed by Ask A Doctor - 24x7 Medical Review Team

Mon, 30 Dec 2013 Answered on

Mon, 20 Jan 2014 Last reviewed on

Question : Hello, I am pregnant and my first ultrasound was at 18 wks. I was told that my due date from the ultrasound is March 1, and my ultrasound at 20 wks showed the same due date. I was not getting my period due to the pill I was on, but obviously was not taking it as I should have been. I had sex May 21 and I had sex XXXXXXX 8. Is it possible that I conceived in May?

Answered by Dr. Sonila Borici (1 hour later)

Brief Answer: Please refer to the following answer. Detailed Answer: Hi, Please bare in mind that the age of pregnancy given in the ultrasound is not the exact one. I'm pretty sure your doctor has given 2 possible due dates (usually +/- 2 weeks). Usually, the calculation of pregnancy is: Due Date = Last Menstruation Period + 9 months + 7 days If your due date is 1 March, then, most probably you conceived in May. However, I'd like to have your last menstruation date. Thank you! Dr.Sonila

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Above answer was peer-reviewed by : Dr. Raju A.T