Miscarriage and miss period

I had a miscarriage/stillbirth at 20 weeks with my daughter in September of last year. Since then my period has been like clock work. I start between the 7and the 9th of the month. I’m currently 15 days late for my period. I think I might have gotten a super faint positive on a equate early response test. I’m really not sure. But any way, with my son(living) and my daughter, I was able to test positive on a hpt within a day or two of missing my period. Should I go in and have blood work done or should I just wait and see if I get a clearly positive test?

This is the test from yesterday morning.