brown discharge?

just finished ovulating (according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a>) & my discharge has been brown lately? pregnancy is impossible, haven't had sex. period shouldn't be here for a week or two. any other explanations?? this has happened at least once before but it was immediately after my period, I just assumed it was spotting.