I had my period two weeks ago approx (it ended approx one week ago) and for two days now, I've had very light brownish spotting that reached my underwear. Today(second day) it feels like I have mild cramps. I'm 20 years old and sexually active, one partner and always protected. I've also noticed a concurrent decrease in my sex drive. Just wondering if this is something I should be concerned about or is it related to ovulation?