Spotting 12 days before period

maria

Hello ladies! So my period isn't due for 12 days but the past 3 days I've been lightheaded, crampy and I've been spotting brown blood with clots. My boyfriend and I haven't had sex for 2 months (we used a condom and he always pulls out no matter what) and I've had regular periods the last 2 months and even took a pregnancy test last month because I'm a paranoid mess (it was negative of coarse). Any ideas what could be up? Thank youuuuu