I'm having very very painful cramps on the center of my belly, my period came and it's gone now, it was a normal period. I'd say I just bled a lot more than usual. And now I've started to have cramps on the center of my belly and it's so so painful that it makes me want to scream. When I have sex, I cannot even do doggy style position anymore because it hurts a lot from that specific position yet the rest is fine to me. From what I know, I am not pregnant (negative home test-period came). What could this be????????