Belly pains after sex?!?!

The past two nights after intercourse I have gotten such SHARP belly pains!! Not cramps, not in my pelvic area, literally all over my belly. My AF is supposed to arrive in 3ish days. Ive been having sex for years with the same partner nothing’s changed and I’ve never once experienced this! I mean it’s not bad enough to go to the ER but it’s bad enough to get the heating pad as I whimper in discomfort😭 has anyone experienced this? Any opinions on potential reasons? I am totally fine during the day it’s literally just been after sex