change my O date to CD31?? I know some of you have said you think I actually ovulated on CD31 and not CD24. My usual LP is 17 or 18 days so my plan was to wait and if I get past that mark with no AF and no BFP then I would change it to CD31. I'm wondering if I should go ahead and change it though? What are your thoughts?

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Well I think your O date may be right.

When I charted I always got a slight temp drop at 4 dpo (I think its due to a surge of estrogen or something) and I know that it is not uncommon for women to have this happen.

So based on that info I think FF might have your date right.

I would do what you planned to do. Wait until 18 dpo, if no and no then change the date.

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I agree with Mandy, I almost always get a temp drop at 4DPO as well. Just wait it out and see what happens. You can always change it later.

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It could be accurate - at this point, I'd wait and see if AF shows up in 4-5 more days (since you have such a long LP). If it keeps going and no +HPT, then I might consider changing it again (actually, FF will probably automatically change it).

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Thanks for the advice I'll stick with my original plan of not changing my O date UNLESS I pass the 18dpo mark and no AF and no BFP.

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