I'm 29, not sexually active, and not on HBC. For maybe the past... I don't know, year (give or take a couple months), I've been often having something that feels like menstrual cramps at odd times. Maybe two weeks before my period, I'll cramp for about a week. Then nothing for about a week, and then I'll start bleeding. I've consulted Dr. Google about mittelschmerz, and this doesn't sound like it: what I have is a very dull pain, which comes and goes in waves, and it lasts for days on end.
Any idea what might be going on? I've got a doctor's appointment next week for something unrelated; I'm wondering if I should bother bringing this up.