Red period blood but light asf??? Pregnant??

So my period was REALLY late like 3-4 weeks late. Tested, Bfn. But now that I am on it, it seems strange this time around. Normally it’s reallllly heavy by day 3 of my period. It’s literally only like 5 drops of blood a day. I’m confused. What’s going on?! Could I still have a possibility of being pregnant? Anyone else ever experience this??