17 weeks??

Question

On this app it tells me i am 17 weeks day 2 on anthor app it tell me 17 weeks day 3. When i go to the doctor they tell me im measuring a day behind. So it would be considered day 2 
, 17 weeks. If that makes since.. They say my due date is march 5th. When did i conceive? If i am considered 17 weeks day 2 exact? So confused.

Answer

They measure your due date at first from the first day of your last menstrual cycle before you got pregnant. After you get your first ultrasound you go by the due date your dr gives you as that will be more accurate. If dr says March 5th. Then that is he day you will use for all of your apps as your due date. The exact day you conceived will be hard to pinpoint unless you were keeping track of when you ovulated.

17 weeks??

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