How are you calculating your due date? When I put both in I get two completely different days (JANUARY 30/February 2)

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Answer

The doctor uses your LMP until you get your first scan, at which point they will use the size of the baby for the gestational age. The ovulation date is of course more accurate but there are many variables that go into that (cycle length, correct predicted ovulation date) so it’s easier to just go with LMP.

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My last period was in Oct 2018 and I conceived in December so they are going off of my ovulation/dating ultrasound measurements. Usually they use LMP though im just a special case due to PCOS causing irregular periods.

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It's either the first day of your last period plus 40 weeks or the day that you ovulated (if you tested and know for sure what day that was) plus 38 weeks.

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My doctor went by the first day of my last period even though I have a short cycle and ovulate early. 
Even when my first u/s lined up perfectly with my dates she continued to use the date she came up with and he’s continued to measure ahead all pregnancy. 
It was only a difference of like 3 days which is literally nothing in pregnancy because babies come whenever they are ready. 
I have continued to use my my date as my due date and for all my baby apps and stuff, while I let her and her office use the date thats 3 days later. 
I’m delivering in two weeks at 37 weeks because of high BP so it turns out neither of the dates even matter 😂

Answer

Does spotting count as the first day? My doctor said yes but so many other things say no...?

How are you calculating your due date? When I put both in I get two completely different days (JANUARY 30/February 2)

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