Hi @milaboo are you in the UK? Here, they are very much frowned upon and your midwife / GP would always advise against getting one. If you have had difficult previous pregnancies please ask them for advice on how to manage anxiety - a Doppler is not the way forward.
I’m sorry to give tough love but you really should Chuck the Doppler away. They are dangerous and give you a false sense of what is happening with your baby. The answer to your question is “yes” you should be able to hear a heartbeat by now, but only a trained professional knows that they’re listening out for.
There are so many problems with Doppler. Firstly, it’s easy to get the baby’s and mother’s heartbeat mixed up. A trained professional knows what to look for. There could also be times whe. You can’t “find” the heartbeat and naturally think the worse but again this could simply be because you don’t know what you’re looking for.
Also, a heartbeat does NOT mean a healthy baby. Someone could be lying in the street having collapsed, but still have a heartbeat.
Dopplers can give a false sense of what’s going on (both ways).
You don’t have long until your scan, and the heartbeat will be checked at all your appointments.
If you are ever concerned about movements, you should go to the hospital, this is the only way to know your baby is well.
If you have had problems in previous pregnancies and have got the Doppler to help you, I would talk this through with your midwife to see what else you can do to help you through this pregnancy.
If you are not in the UK... well.. I know in USA these are popular but we advised well against in UK