Spotting for 4 days - no period - 11/12dpo

I’ve been spotting brown blood for 4 days now and my period still hasn’t started. Been taking tests every day until today, because I ran out, and they’ve all continued to be negative. Could I still get a positive? My period isn’t actually due for 2 more days and I’m about 11/12 dpo. I just feel like if this spotting was a result of pregnancy, I’d have a positive test by now. But also I’ve never spotted for this many days. I usually spot for about 2 days before my period starts. So I’m feeling confused. Help!