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Ask Dr. Norm S. Your Own Question
Dr. Norm S.
Dr. Norm S., Board Certified OB/GYN
Category: OB GYN
Satisfied Customers: 11243
Experience:  Over 30 years of experience in OB/GYN practice, including teaching students. Fellow of American Board of Obstetrics and Gynecology.
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If someone has their Period on July 11th but has an ultra

Customer Question

If someone has their Period on July 11th but has an ultra sound that states they are 6 weeks 6 days in term which would be July 5th is this possible?
Submitted: 2 years ago.
Category: OB GYN
Expert:  Dr. Norm S. replied 2 years ago.

What was the date of the ultrasound? Thank you.

Customer: replied 2 years ago.
The date was August 20th for the ultra sound
Expert:  Dr. Norm S. replied 2 years ago.

An ultrasound of 6 weeks 6 days on August 20 gives a conception date of about July 17.

Remember that when the ultrasound (or the doctor) says you're 6 weeks 6 days pregnant, that means that conception occurred 4 weeks 6 days ago. the reason is that by tradition, a pregnancy is dated from first day of last period (approximately 2 weeks before conception). When ultrasound began being used to date pregnancies, that tradition remained, so any dating of a pregnancy is 2 weeks longer than the actual duration of the pregnancy.