Brown Discharge..?

I'm not on any birth control, and my boyfriend and I were having unprotected sex when my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> app said I was ovulating as well as when my fertile period ended. At no point did he cum in me, however I know pre cum can get an individual pregnant. For 5 days now (2 days after we had sex), I have been having brown discharge. For the first two days it was light pink, but is now brown and a little bit of mucus stuff too. I'm really stressed out about this, as it resembles spotting in early pregnancy. My period is due in 6 days, if anyone has any idea what course of action I could take I'd greatly appreciate it xx