Super late

So Af was due 11/8 I know with PCOS most aren't regular but I'm never late. Two bfn I'm getting so frustrated I was just prescribed clomid but can't start till af comes... Anyone had similar issues? Oh one more thing Dh and I had sex last night and immediately after I had the worse pain in my lower abdominal area so bad I could barely move. No pain during sex and it went away after a couple minutes...