Am i getting cancer?

Go
I'm depressed right now. Few weeks ago i was diagnosed that i have PCOS. I had sex 1 time a week ago and had to use pill cus the condom's broke.  Yesterday i had sex again and after a couple of hours i start bleeding  and the colour was more of dark brown with clot. Glow predict that my period will come next week. I feel a little cramp and back pain. I have a strong feelings of something real bad is happening to my uterine. 
I've been really depressed lately. We broke up yesterday... I am really happy if you guys can share your experience with me.