Period or Miscarrage ?

Me
This Saturday I got my "period". I've been having really bad cramps, I feel like I have to pee so bad and it hurts.... That same day i took a shower and I saw blood like chunks of mucus. Yesterday I was waiting for the pain to go away by peeing or something but I almost fainted. I bearly made it to the bed. I felt so bad and I almost couldn't breath! I honestly think somethings wrong. My supposedly period is gone. And I've before all this happened my boobs were hurting and they still do... I was also having hard time to pee cause it hurt. What should I do?