All of my symptoms disappeared about 5pm on Friday and then AF showed last night, about half a day early. I'm out.
I'm convinced this was a fertilized egg failed to implant kind of cycle, rather than a no luck at all cycle, which makes me feel a bit better about this not being our cycle, because at least it means we did everything right and caught the egg.
I think what I was feeling 8-11dpo was the embryo trying to implant, and I think our BDing on the evening of 11dpo put a stop to it. I know a healthy embryo that's permitted to implant will do so and stick, and BDing isn't going to shake it loose, but I don't think this one was going to stick anyway. I think we just put an end to the failed attempts. I felt different immediately after we BD'd. I know there's no science to back up this kind of thing yet, but I've read lots of accounts from other ladies who swear they could feel the difference on this sort of cycle.