16 DPO, CD 31, no AF, BFNs - but 3-4 days late!

I'm 40 and my husband and I finally decided that we wanted to have kids recently, so I went to see a RE because of my age and the fact that we haven't used any birth control in 4 years (we've only been married and living in the same state for about 10 months now).

Everything has checked out normal for both me and my husband (his morphology was a bit low, but still normal), and we did Clomid/Ovidrel on the 20th of this month, I O'd (I think) on the 22nd, and I'm now on CD 31, 16 DPO, no AF, and 2 BFNs (at 12DPO and this morning). My cycle has been 25 to 27 days since July, so this is long, but I've heard that Clomid can do that.

This morning, I started cramping - not terrible, but just really annoying, so I keep thinking AF is coming, but the cramps are really low, right above my pubic bone and sort of pinching/pulling rather than the usual, and there hasn't been any spotting of any kind like usual.

So, if AF doesn't come this weekend, I go to the RE Monday morning for bloodwork...it's nice to know that I'm not the only one going through this uncertainty. It can drive you crazy!!! And it's taking up so much of my time - I'm not concentrating on work or much of anything else, which probably isn't good, but it's not easy to stay focused when I don't know what's going on with my body!

Anyway, just venting. Wish me luck. Hope everyone has lots of luck and BFPs!