whats the lowest hcg level easy@home amazon pregnancy test can detect??

Samantha

I found out i was pregnant June 3rd found out i was miscarring June 14th 2018 my hcg level never got past 54 last week my HCG level was 19!! Just got these cheap easy at home pregnancy tests today in the mail from amazon and they are still positive does anyone know what the lowest HCG they read is??? the top one is from just now bottom two are from 8am?? I had my blood drawn today hopefully that gives me answers ive been so exhusted the last few days like can barely keep moving exhusted 😞