I took plan B about a week ago. I took it within 24 hours of having sex. We used a condom and he didn't ejaculate inside of me, I just had a feeling there was a hole and I wanted to be on the safe side. We also had sex the day after my period which is the 8th day of my cycle. 5 days after I started bleeding. It's really light has been going on for two days now. But recently it started getting dark brown and slightly mucous-y. What is going on? Is this normal? Should I be worried??