Heartbeat

Hi guys. I go for my first sonogram Thursday, it will be five weeks six days. Last time when I was pregnant we only saw the yolk Sac and gestational sac at this point but my hcg was only 1944. I miscarried a week later about. This time my hcg at 4 weeks 2 days was 460.2 so I’m hopeful this pregnancy will stick. I am not sure if I should expect to see a heartbeat this early. At what hcg level did you hear your baby’s heartbeat and how many weeks? My doctor told me usually between 7 and 8 but I read that if the hcg is over 10,800 you hear it and If my levels keep doubling I might be at that point by Thursday. Just hopeful everything looks good for 5 weeks 6 days but I would be thrilled to show my husband a heartbeat for Father’s Day!