okay, so today I noticed this black/dark brown looking discharge in my panties today when I went to the bathroom. a few hours before I saw it, i was having really bad cramps and faint hot flashes. My boyfriend and I had unprotected sex last weekend. I took a pill. And now this is happening. I'm supposed to ovulate on Sunday. what could this be? it's like this black-ish, super dark brown paste. on the other side of my panties it looks liken it's dried blood. But why is it pasted? can anybody please tell me what this is??