slammerkin
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Yes, Shaele, most due date calculators just go by last period date and an average menstrual cycle. And that's all a doctor is going to go by as well. I would trust FF's prediction based on O date. I've heard of a lot of women having to fight with their doctor over their due date because the doctor won't rely on the woman knowing when she O'd. It can be important because doctors usually have a policy about how long they're willing to let you go past your due date before inducing. A couple of days can make a big difference if you find yourself past your due date, and really want to avoid getting forced into an induction. For that reason I've seen some women just lie about the date of their last period - adjusting it to whatever it needs to be to correspond with the due date based on ovulation. That's what I did with DD (though it was only a 1 day difference in that case anyway) and what I plan to do with the next one. I went to my first appointment and they're excitedly telling me when I'm due, and inside I'm like...yeah...I don't need you to tell me! Lol. I think the majority of women don't do cycle tracking/temping and rely on the doctor to tell them, but if you're tracking then you're already set.