Prenatal doctor only using a heart Doppler😒🙄

When I have my appointments I get excited to see my baby on the ultrasound, but my doctor refuses to use it . Instead she uses a heart Doppler to check if the baby's heart is beating and that's all .what if there's something wrong with my baby and I have no way of knowing?  
Debating if I should go somewhere else . What do you guys think ?