AF issues

Anyone have irregular cycle post laproscopic surgery?? I am a very regular person typically and had LAP done about 4 weeks ago...I finished my cycle in April the day of surgery and was due again May 26, but I have been cramping badly since Sat and still no sign of AF.

I am frustrated bc I am waiting for AF to come so I may begin my first cycle of clomid! And no..I am not pregnant.