First of all, I don't know you but it sounds like the ttc is a bit of a roller coaster for you atm.

My cycles were always irregular - anywhere from 19 to 37 days! They 'settled' about 6 months before we conceived DS but I still have very different cycles depending on what side I O from - short one month, 5-7 days longer the next month. Could that be what is happening for you? Also, maybe you just didn't O last month and that is why you had a short cycle and AF is different? As for the pain, it could be anything really - it's all only speculation without a FS and tests. Have you seen the FS before? Had tests for endo? Just make sure you keep note of all this for the FS appointment as it may help pinpoint what's happening.

Um, I'm not sure if any of this is reassuring for you. It's meant to be!