Thoughts?

Ladies, I need your help. I'm so confused. At 12 dpo, I got a faint positive. Faint, but there. Same thing at 13 dpo, but I also started spotting. Very light, only when I wiped. 14 dpo, faint positive. I started bleeding that night (Sunday night). It was light for me, but enough to warrant a pad. Two days later, I'm done bleeding. I'm still getting faint positives and I still have symptoms I was having before I started bleeding (nausea, dizziness, fatigue, breast tenderness) I can't shake this feeling that I still might be pregnant. I thought it was a chemical pregnancy because I started bleeding, but my periods last at least 4 days. I'm probably going to end up going in for a blood test, but do you have any insight?