I use to have really long cycles. Up to 7 weeks. I could never tell when/if I was going to ovulate as my CM and cervical position were all over the place. I temp as well and becasue of that was able to know approximately when I ovulated (after the fact), and therefore when I should expect AF.
It is possible to ovulate just before you get AF, but unlikely, and if you do and it happens regularly it means you have a really short luteal phase, and this can cause problems when TTC.


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