A member asked:

How can i know the length of my period cycle if every month it's different?

A doctor has provided 1 answer

You can't, but...: Only if the cycles are regular (about the same length) can one truly know her cycle length. If they are not regular, the best she can do is average the lengths of the last few cycles, and end up with a good guess.

Answered 1/3/2015

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