Hsd my tubes tied 18yrs ago went to the hospital for syncope and they heard a heartbeat can anything else sound like a heartbeat?

Heartbeat. Unfortunately you did not provide enough info on where and how the heartbeat was heard. Based on the limited info, if heartbeat was heard on the abdomen by doppler, this may be your own heartbeat or that of a pregnancy if your pregnancy test is positive. The concern after tubal ligation would be the possibility of tubal pregnancy. If pregnancy test is positive, make sure you are evaluated for that.