A member asked:

My lmp was nov 4, 2015. i just did a tss showing 7wks, 6days instead of 14wks. fhb is 169 and everything else appears normal. why are the dates weird?

2 doctors weighed in across 2 answers
Dr. Euton Laing answered

Specializes in Family Medicine

Pregnancy dating: Not clear when you got pregnant, you could have missed a period without being pregnant. Follow up with your OB and they will do another US later in pregnancy, that will confirm the age of the pregnancy.

Answered 2/13/2016

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Crown rump length: Fetal crown-rump-length determined by transvaginal ultrasound is very reliable in determining the gestational age. Gestational age determined by TVS trumps gestational age by last menstrual period.

Answered 2/14/2016

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