Brown Discharge/Plan B

The condom broke on Jan 16th, took a plan b within 45 minutes of everything happening. It was my first day of my ovulation period as well. On the 24th, 3 days after ovulation ended I started to get brown discharge. The brown discharge is still going on 5 days later. I’m suppose to start my period in 5 days (Feb 2nd). I took an early detection pregnancy test and it came back negative immediately. Obviously I will take another one, but I need opinions. I’m extremely paranoid