The condom broke and I took plan B just to be safe, and now my period is lasting too long

Me and my boyfriend were having sex the condom broke but we checked there was nothing in the condom no residue spots either. Just to be safe I took plan B about 45 minutes later. I was on my period when we had sex had about 3 days left my period is always 8 days long. I started my period on Friday October 9th and we had sex on Tuesday October 13th basically midnight. Plan b (or at least I hope it was plan b) extended my period 4 days so I didn't end it until Tuesday October 20th. Then on November 11th I got my period 4 days late and I was supposed to end it on the 18th. Which it's basically gone but for the past 3 days I've had this very faint pink discharge that most people wouldn't even notice but I'm extremely observant. Could this be due to the plan B? Maybe my body is thinking that my period needs to be longer since it was like that last time. Please I'm just looking for an answer. Also the period that I had was completely normal I just don't know why it's lasting longer.