BC question. brown discharge!?

Hi,

I went back on BC a few months ago. This month, about a week ago, I started spotting brown discharge. The past two days I’ve had it plentiful. It’s gross so I’ll spare the TMI picture.

Why and what could this be? I’m due my for

period in a bit over a week.

I know brown blood is old blood, but I had a nice 7 day period last month. This is a lot.

Thanks.