I know it’s been asked so much but

Many women have only 2, max 3 ultrasounds. How do you know that your baby still has a heartbeat during in between appointments? I don’t want to buy a Doppler because I’m scared I won’t be able to find heartbeat, therefore stress myself out. So many women are announcing their pregnancies, buying baby clothes, etc. Do we just assume baby is doing okay in between sessions? God forbid but how do you trust you haven’t miscarried and the baby has been in there for weeks without you knowing?? 😖