You are confirmed pregnant heartbeat monitor finds heartbeat but ultrasound can't find embryo?

You must go for a second opinion. When the fetal heartbeat is present there must be a fetus. Sometimes a woman can have an ectopic pregnancy and the fetal heartbeat can be heard, but the fetus is not in utero. It is in the fallopian tube. This is a serious condition so you should definitely get a second ultra sound. ASAP!!!