Last month my hubby and I had unprotected sex (oops!) while I was ovulating, and for the next day and a few days afterwards I experienced painful menstrual like cramps. I thought for sure I was pregnant and took a test just before I was due to get my period. It came back negative and 2 days later I did get my period. Then once again, sex during ovulation, this time my hubby wore a coat!! And the next day cramps. I am not a doctor, but my guess is that I may have a cyst and ovulation combined with intercourse sets it off. I'm not entirely worried, more releived that I wasn't pregnant (have 2 beautiful kids and want to stop while I'm ahead!!). I do plan to see a doc, though. My advice? Conception is not painful, and does not cause cramps. Take a test to be sure, but see an ob/gyn for any other possibilities.