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Bronx, NY
A 20-year-old female asked:

I had unprotected sex september 26 i had an ultrasound done i am 5 weeks and 3 days pregnant is it possible i conceived on that day or before ?

1 doctor answer1 doctor weighed in
Dr. Leslie Miller
Obstetrics and Gynecology 31 years experience
dating a conception: Yes, if you are 5 3/7 today, then on 9/26/13 you were day 11 of cycle so most likely the sperm either made you pregnant that day or within 72 hours after, often ovulation is on day 14 but you can ovulate earlier, perhaps day 12 for your pregnancy. Eggs can be fertilized in a 12 hour window of ovulation but sperm can live for 3 days. Ultrasound dating is accurate but can vary as well.

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Last updated Feb 2, 2015

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