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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Had Light Bleeding, US Scan Showed Pregnancy. How Do You Calculate The Weeks?

Hello I just found out that I pregnant.last night I went to the hospital due to light bleeding they performed an early ultra sound an told me that I was 5 weeks an 2 days preganat. Now I\ m kind of confuse because due to my calculations I should be 8 weeks and 3 days pregnant with my last period started on December 2 2012. Can u explain
Tue, 5 Feb 2013
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OBGYN,  's  Response
Hello
thanks for your query.
As per your last menstrual period, you are right.
The gestational age should have been more than 8 weeks.
But there are two possibilities :
One is that you had a late conception due to delayed ovulation, which would show up in future on repeat scans as a continuing normal viable pregnancy, apart from the discrepancy with the menstrual age.
The second is that this is a failed pregnancy, which is not growing normally.
This would also show up if the serial growth of the fetus does not occur on repeat scanning.
Take care.
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Had Light Bleeding, US Scan Showed Pregnancy. How Do You Calculate The Weeks?

Hello thanks for your query. As per your last menstrual period, you are right. The gestational age should have been more than 8 weeks. But there are two possibilities : One is that you had a late conception due to delayed ovulation, which would show up in future on repeat scans as a continuing normal viable pregnancy, apart from the discrepancy with the menstrual age. The second is that this is a failed pregnancy, which is not growing normally. This would also show up if the serial growth of the fetus does not occur on repeat scanning. Take care.