My husband and I had unprotected sex on CD 8 and 12. On CD 14 and 16 we used the withdrawal method. I have a regular 30 day cycle and O was predicted to occur on CD 16, but I think I ovulated a few days before then. Today is CD 22 and yesterday I felt crampy on and off with the pain moving to my lower back. No spotting. Bloated and tired. Is my mind playing tricks on me?