When does another week start contained by pregnancy?

For example my due date is Dec. 4th which is on a friday. Does that mean like today I am 21 weeks since its a friday?
yes that is what it means.
no its from the date of you lmp .. mine was november 17th .. that was a monday .. so every monday begins a unusual week of pregnancy for me .. so im 35 weeks 4 days .. on monday ill be 36 weeks
Answers:    If your due date is on a Friday then yes, that scheme you turn a new week on Friday's.

I turn a new week on Tuesday's since my due date is on a Tuesday (September 15th)..

Your due date is when you turn 40 weeks, so count back every week on that same year to find out how far along you are.
yes maam thats what it way...

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