About a week and a half after my period, I started getting dark brownish-red discharge. This began around my fertile window so I assumed it was just ovulation spotting, although I've never experienced that before. It's not heavy enough/ has lasted longer than my usual period so I don't think it's just an irregular period.  I haven't had sex, I am not on any birth control (no need to be), and I am nowhere near menopause. There's no pain along with the discharge and I feel fine otherwise. Is this normal or something I should be worried about?