What date should I tell my pregnancy app to get an accurate weeks measurement?

Question

Answer

To be perfectly honest  I would wait until your dating scan. When I went for my first scan, I should have been 8 weeks 6 days from my LMP but when my baby got measured, I was actually 7 weeks 3 days. So today I am 8 weeks 1 day. I've had to change my due date so many times. I will more than likely have to change it again once I go for my proper dating scan in a few weeks time. So what you are is just of a rough estimate.

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If you ovulate late or early then your last cycle won’t be an accurate calculation. For instance, I ovulated on day 21, not day 14, so going off the ovulation date (if you for sure know when that was) is actually the most accurate way to tell.

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Your doctors go by the first day of your lmp until a dating scan.

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My baby is measuring one day less than what my lmp says it should so I think going by that is probably the most accurate you’re going to get.

What date should I tell my pregnancy app to get an accurate weeks measurement?

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