Starting a week early?

So I’m 22, and my period for the past few years has always been very consistent l, never more than a day late or early. I’m also on the pill.

I’m a week before I start and am have some cramping and even had a tiny bit of brown discharge, like old blood. It was honestly hardly anything, like if you squish a mosquito.

It was a very small amount, but it’s got me on edge.

I’m also cramping a lot rn.

Has anyone else gotten this? I had unprotected sex with my boyfriend Monday night, but I take my birth control on time everyday.