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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
Asked On : Sat, 2 Feb 2013
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OBGYN 's  Response
Mar 2013
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.
Answered: Mon, 4 Feb 2013
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