Spotting?

Quinn
I recently had to start a new brand of pills and about two days ago I noticed some brown coming off on the tissue when I wiped. Usually my "periods"are like that, but I haven't had one in a couple months(which I know sometimes happens when you're on the pill). I'm on the end of week three with my new pills so I'm just wondering if this is spotting I'm experiencing? My boyfriend and I had sex about 2 days ago, so could that have anything to do with it? The discharge didn't start showing up until after we had sex.