Bfp or lingering hcg?

Emily
I miscarried on February 27th with hcg levels at 34. By March third my hcg levels were at 8. My SO and I never stopped ttc and after some tender breasts and being so close to AF, I tested this morning and got a very very bold pink line and an almost immediate "pregnant" digital and after the three minutes it said "2-3 weeks." I'm trying to not get my hopes up but I don't want to neglect it if it is a seperate, new pregnancy. Thoughts?