Extreme pain cervix area

So I'm about a week late on my period, and just last night (after having had sex earlier in day) I get extrutiating pain that is "like" cramps but not my normal period cramps. It's sharp and random, sometimes only hurts when I move a certain way. My s/o and I attempted to have sex and it was fine until he went in too far and it was a very sharp pain .. Assuming it's my cervix but idk what could be going on? Blood clot? I've never been pregnant.. Thanks!