Is it normal?

Nadia

I spotted 3 days ago... it was just red when I whipped and that was it. My period is supposed to arrive today March 2nd. But I’m spotting brown discharge since March 1st(yesterday). Is this implantation or period? I’m 12 DPO... I’ve been checking on my basal temperature and CM everyday. I don’t know what to think. Pregnancy tests came negative today!