help? advice?

my boyfriend and i were getting a little passionate the other night, lol, and we almost had sex. keep in my i’m still a virgin. he started to put it in me... but after a minute i stopped him. he didn’t have anything on and i realized it wasn’t the right move for us. however. it was the peak of my ovulation and since then i have had some cramps. coincidence or not?? kinda scaring me