What Causes Brown Vaginal Discharge Post Intake Of Plan B?

Hi. I am a 32 yr old woman. On Nov 13 I had unprotected sex and decided to take Plan B on Nov 16. A week and a half after taking Plan B, I got my period. It was a normal flow and it lasted 5 days. Which is what my normal periods last for. Two weeks after my period ended, I had sex again, but, this time the condom broke, so out of precaution I decided to take Plan B again. A few days after taking Plan B, I began to discharge a brown/reddish. To this, my nipples were sore as well. It lasted 4 days and then it stopped and so did the soreness of my nipples. On Dec 27, I began to spot a light pink so I thought it was my period. I decided to put a liner on, for the next 4 days I only spotted but, only when I wiped and the color began to get brighter. I have taken 4 different pregnancy tests in the last 4 weeks and they all come back negative. My breast are not sore, and I do not have any symptoms of pregnancy. My blood flow is heavier now, but it’s been 10 days already. I already made an appointment with my ob, but she won’t be able to take me in until the end of the month. I just want to see if I can get some sort of an answer to ease my mind a little bit. Thanks.