Huhh?? What is this

Tuesday morning ( the morning after I had done a lot of errands and moved around ) I woke up to pee and when I wiped there was one single drop of red blood. I was 13w3d. I wiped again and there was one more single drop. I had no cramping or pain and I didn’t have anything else. The next day I woke up with no bleeding, went to school & moved around and then Thursday morning woke up to the same thing. One single drop of blood this time on my underwear (pictured). I’ve had nothing since and also haven’t been out of the house. I’ve had my same sore boobs & nausea and don’t get to see my doctor until Jan 2 when I’ll be 15w4d. Does anyone know what this could be? I’m trying to not overstress because of how little there was.