| Re: wondering?
You can always chart your fertility signs. This will let you know when you are truly late (as in ovulation happened and your period didn't come) and when you just didn't ovulate. If you just want to use it to predict your periods, this could be as simple as wiping before you use the bathroom and checking for cm. If you wanted to use it as birth control, I'd definitely read Taking Charge of Your Fertility by Toni Weschler.
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