Looking for tips and tricks for using an at home doppler

Amber

Hello everyone

I’m 10w3d and my sister brought over her doppler she had used not long ago.

Looks for any tips or tricks but mainly how do you decipher your heart beat verse the babies? I thought I found it today and my sister died laughing saying that was my heart beat, I personally thought it sounded fast enough to be the babies..😂🤷‍♀️😆😬😕