5w6d us

5w6d and went for US after some bleeding. Saw yolk sac and gestational sac measuring 6w1d, no baby/heartbeat yet. My HCG doubled appropriately. It was 1,146 then 7 days later when I had it done after my US it was 13,965. Is this ok? I go back in a few days to check again. I’m so worried there still won’t be a baby.