What Causes Dark Vaginal Discharge, Sore Breasts And Abdominal Cramps?

Good Morning, I am 26 years old. I am on cycle day 11, for the past 2 days I have been spotting brown cervical mucus along with sore breasts and slight cramps with bloating. Its creamy and dark brown, its not enough to stain a pad but it is a lot when I wipe. I have never experienced this before. My period this month was 2 days early. I got my period between Jan 31\ Feb 1. It was very heavy all the way until day 4, the heaviest I've ever experienced if I must say. I had unprotected sex on Jan 31.