Help!

I started my new pack of b/c pills and then I went out of town and forgot them. So when I got home at I took the ones I missed and the one for that day so Thursday,Friday and Saturday. Well Sunday morning I woke up and had brown blood as of it was my period. (I was told that it was just old blood that didn’t make its way out) And it’s been over a week and it’s still happening! I’ve continued to take my pills like usual I thought that would stop the bleeding but it hasn’t. Does anyone know what I should do!?! Am I supposed to just let it happen until I get my real period again when I get to my last week of pills or do I take my week of period pills?!? Does the bleeding ever stop?