Brown discharge😖

Hey girls!! I’m 17 and a few ago I doubled up three times within 2 weeks. I wasn’t taking it on time either. Well about 2 weeks ago I started getting a brown discharge and I thought I was about to get my period. But I wasn’t due for 3 more weeks. It’s light.. it doesn’t burn down there or itch and there’s no odor. It’s getting to be a little more heavy. I’m also sexually active I don’t use condoms because I’m on birth control. So could I be pregnant from when I doubled up a few weeks ago? Or did I just throw my hormones off.