Fetal Doppler baby’s heartbeat 💓

Monay

So I’m 11 weeks pregnant and I’m trying to listen to my baby’s heartbeat today. So I can hear it but it’s faint and I couldn’t get a reading on it. And also I got a reading of 168 and 172 but I couldn’t hear the heartbeat but I got that reading for only a split second then it went away But thats the baby’s normal heartbeat. What can I do to hear it and get a reading. I can hear it the other time I took it but I’m having a hard time this morning.