Late Cycle

So I just finished my 1st round of 50 mg Clomid. I had my cycle day 21 progesterone test and it was very low - like 0.5 low and the month before it was 11! The nurse told me that it would be unlikely that I conceived this month, but not impossible.

I am currently on cycle day 37 and 17 DPO. I have had mild cramps the past week but that’s it and no AF in sight. I tested today and got a BFN. My cycle is never this late or irregular! I usually have had AF by cycle day 28, if not sooner.

Has anyone else had issues with Clomid causing their cycle to be off/irregular?