Chemical pregnancy - blood test necessary?

I’m experiencing what I’m 90% sure is a chemical pregnancy - saw a squinter at 9dpo, barely got any darker from 10-13dpo, positive digital on 10dpo, now is back to a squinter at 14-15dpo. Do I need to worry about checking HCG blood levels at this point or just wait it out? Is there a point I should worry if I haven’t started bleeding and I’m still seeing squinters on a test? Just don’t want to miss an ectopic at this point either. Also wondering when I should expect bleeding - this limbo sucks because I’m just bracing myself for an extra heavy period at this point.