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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Decreased Gestational Age On Scan During Pregnancy?

so i know for a fact that my LMP was Nov 22 but my OBGYN says that i am not due till Sept 15th, they are going off the US, but i had Hyperemisis the first 5 1/2 months of the pregnancy and lost more than 20 lbs. I am currently according to them 39.4days and have GBS, I need to know if i am at risk for issues bc i think i am 41.4 day and they will not do anything till Next thurs the 16th
Tue, 1 Dec 2015
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OBGYN,  's  Response
Hi,

The expected due date (EDD) calculated by a ultrasound in the first three months is more reliable than the EDD calculated by the LMP. So that is why probably the doctors are waiting till the EDD they have calculated. More over we wait up to 42 weeks to induce pains and upto 10 % of pregnancies are postdated, with normal outcomes. So you need not worry about it.
Regarding the GBS, you will need intravenous antibiotics once you go into labour. This is to prevent your baby from getting the GBS.

Take care .
Hope this helps.
Regards.
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What Causes Decreased Gestational Age On Scan During Pregnancy?

Hi, The expected due date (EDD) calculated by a ultrasound in the first three months is more reliable than the EDD calculated by the LMP. So that is why probably the doctors are waiting till the EDD they have calculated. More over we wait up to 42 weeks to induce pains and upto 10 % of pregnancies are postdated, with normal outcomes. So you need not worry about it. Regarding the GBS, you will need intravenous antibiotics once you go into labour. This is to prevent your baby from getting the GBS. Take care . Hope this helps. Regards.