Random Bleeding

So about a week or so ago I was wiping and noticed some mucus/stringing brown stuff coming from my vag. I thought that was weird because I’m not supposed to start my period for a couple more weeks. I still get some more of that brown stuff throughout the day and it eventually goes away. And then yesterday I wipe again and get more of it. And today as well. I have minor cramps every time I notice it also. I take the mini pill and have been for almost a year now. My bf and I had sex w/out a condom right after my last period but he never came inside. I am trying not to freak out and think it’s implantation bleeding. I thought it might be ovulation bleeding but it keeps happening so I don’t know if that is it. What else could it be? My period starts in 7 days.