This March, my period was 3-4 days late but I got eventually and it lasted for 5 days. I haven't experienced any spotting before periods except when I took Plan B a year ago. So last night, I took some laxatives because I was feeling constipated. I took to pills of laxatives and this morning I had diarrhea, then this evening I went to take a pee and a light amount of brown blood started flowing. The app says that my period won't arrive until a week. I'm really confused as to why because I haven't had sex since last year and my last sexual activity was oral sex and dry humping last February. There's no penetration whatsoever. Can someone explain to me what's happening to me? And what is this brown blood?