When you say you bled with your last pregnancy, was it like a menstrual bleed? Generally bleeding is not a sign of a viable pregnancy if you were pregnant. Bleeding for 4 days with 2 nagative pg tests is a pretty good indicator that pregnancy did not take place this month.
I think we have the same cycle get a FRER home test has the lowest hormone detector. I tested positive four days before my next period. Best off luck