FISTING

So I know this may sound stupid and please no rude comments it's a genuine question that I've been googling for hours!!! My bf fisted me for the first time the other day and he went really deep and he swears he felt the cervix and out of curiosity stuck a finger in and felt a smooth round surface, he's assuming it's the baby's head. I'm 37 weeks now so maybe I am dilated a bit not sure and I've also read about measuring your own cervix and that it is possible to reach in and check for dilation and to even feel the baby's head through the amniotic sac. The same way doctors do it, so do you guys think he really felt something or he's just paranoid???

EDIT: I will ask my doctor about this since y'all seem to be worried and have worried me lol.

ALSO it was actually much easier to put a fist in than I thought, I'll add that he doesn't have big manly hands, they're actually smaller than mine lol. It wasn't painful at all, a bit uncomfortable at first, it's like anal, you have to start slow and next thing you know it's actually in there and you're like wow this really works lol. Yes it was very pleasing actually!!! He kept making jokes that giving birth might be easy seeing as I can take a fist in lmao.