So I Took Plan B On April 13, Due To

So I took Plan B on April 13, due to a broken condom. Long story short, I got my period like two days early. In May, my period was about a day or two late. In June, my period was four days late. It's July now and my period was about 3 or 4 days late and I just got off of it. It lasted nine days which is about a day or two longer than usual. Yet I've been having brown spotting for the last day. Is that normal? I also had intercourse last Tuesday and last Friday. Can this be implantation blood or just dead blood from my period or the Plan B still messing up my schedule? Just want to know because I'm a very paranoid person lol. Also, my period was surpsingly lighter than month and last month was surpsingly heavier, if that makes a difference.