Late Period or Miscarriage?

Caitlyn

So I had unprotected sex June 10th and my period was supposed to start the 11th, it didn’t come until this Saturday and it started off spotty, and a dark brown. Now it’s back and forth between red and brown but it’s clotty and has what looks like mucus and I feel like my period is a lot heavier than normal I’ve filled almost the whole bottom of two pads with dark red blood. Now it’s starting to slow down again I’m confused and didn’t know I was pregnant with my Angel baby so I don’t really know what to look for. I also woke up nauseous the 2-3 days before my period started…. HELP