Likely having a miscarriage

Went to the ER yesterday for bleeding and cramping and I was passing clots. My hcg came back today and it was 1065. The last one drawn before that on December 13 was 458. My doctor said you never know but things don’t look good. I’m devastated because I really thought this transfer would work. I was so excited for my little girl to be a big sister and I’m struggling with guilt of wanting another one when I’m lucky enough to have just one, and feeling like maybe I should don’t something different to make the outcome of this successful. I’m still hoping and praying that it’s just a slow growing embryo and maybe I will get good news, but I’m also not too optimistic and trying to come to terms with everything. Prayers are appreciated