Just wondering if anyone has had the same issue. I had laparoscopy surgery to remove an ovarian cyst 21 days ago, which was on cycle day 7. My next AF was due CD 24, but never appeared. Today is CD 28, making me 4 days late and very unusual. There is NO chance I am preg. Just wondering if the surgery caused this, maybe resetting me somehow. Any help would be appreciated. Thanks!!