Ever gotten your period from sex?

So it wasnt my time of the month quite yet & i had sex and started my period halfway through. I thought it was unusual timing but just figured life sucks and moved on.

Now a week later when my period is over, i go to have sex again and the same thing happens! I didnt have it at all in the beginning and then it came. I think he hit the on button inside of me or something. It felt like he hit the end of my pussy (i dont know the scientific name for it pls forgive me. Possibly the cervix?) and then i started bleeding again.

What the hell is this all about and when is it going to stop because im tryna get it in. Has anyone else experienced something like this before? Getting your period from sex?