3 doctors weighed in:

My last period was near the end of february, april 26 an ultrasound dated my pregnancy 7 and a half weeks, when did i concieve?

3 doctors weighed in
Dr. Lisbeth Jordan
Obstetrics & Gynecology
1 doctor agrees

In brief: Mid-March

A first trimester ultrasound is accurate within about a week for determining the estimated due date.
Conception can only be estimated because it can be a variable date. However, based on a first trimester ultrasound, conception probable would occur around march 15-20.

In brief: Mid-March

A first trimester ultrasound is accurate within about a week for determining the estimated due date.
Conception can only be estimated because it can be a variable date. However, based on a first trimester ultrasound, conception probable would occur around march 15-20.
Thank
Dr. Joe Merritt
Obstetrics & Gynecology

In brief: 5.5 weeks previous

Most pregnancies are dated from first day of last period.
This is assumed to be 14 days before ovulation and conception; so if you were 7.5 weeks "pregnant" the conception would have happened 5.5 weeks earlier than the ultrasound.

In brief: 5.5 weeks previous

Most pregnancies are dated from first day of last period.
This is assumed to be 14 days before ovulation and conception; so if you were 7.5 weeks "pregnant" the conception would have happened 5.5 weeks earlier than the ultrasound.
Thank
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