Lightening crotch????

I've just been literally floored by what I assume is lightening crotch. Baby was having a really good kick about and suddenly I felt pain in my cervix like nothing else. I had to sit down and actually cried out in pain! The pain wasn't a flash it lasted a couple of minutes maybe 3 minutes tops and is now coming and going but I am also having period type cramps aswell :-/ loving all these new things that keep cropping up ... not!