Missed period on pill?

I’ve been on the minipill for over 6 months now. I had unprotected sex with my boyfriend the first week after my period(first week of pills) he did not ejaculate inside me though. Skipping onto my third week of pills, I missed a few and was taking them later than usual due to being on vacation. I should be on my period now but all I’m getting is VERY light brown discharge. What is going on?