Girls, help me figure it out. I have an embryonic period almost 6 wee…

Girls, help me figure it out. I have an embryonic period almost 6 weeks (medical almost 8), hCG shows an embryonic pregnancy period. hCG: 9.08 was 2030 mE/L, today: 13.08 - 3543 mE/L. Is this normal development of the embryo? Yesterday I had an ultrasound, a young doctor didn't see the embryo at first, then she saw it but said there is suspicion of a miscarriage, that's why I went for a hCG test.