I was 15 days late for my period I didn't take a test (stupidly I should of) and yesterday day I had pinky white discharge and lower back pain, last night I just had a gush come out of me and it was blood. Today I've had to keep changing my pads every 20 minutes because they soak right through. I've still got lower back pain and lower abdomen pain but the abdomen pain isn't too painful mainly my back. Help what is this?!