I keep getting AF cramps, but I'm on CD 10. What could it be?

Kathy

My period was the usual 6 days long, and on CD 8 & 9 I had unprotected sex but using the withdrawal method (not really ttc or preventing). I noticed some pain during intercourse, so I think my cervix was low. But I'm not sure, this is all pretty new to me and sex ed class didn't teach me anything.

Help?