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Avatar universal

Confused at when I conceived

I'm supposedly 15 weeks and 4 days today, my last period was either dec 10th or dec 12th can't quite remember, my  expected due date is Sept 17, 2017 but I'm unsure of how they calculated that due date , cause I had to conceive before the 17th of January
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Avatar universal
Now it makes sense lol thank you so much
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Avatar universal
If you count back 40 weeks from Sept 17, you end up on Dec 11th. So it is right on with your last period. You typically conceive about 2 weeks after your last period, but the 40 weeks starts from your start of your last period.
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