Today we used our fetal doppler that came in the mail and it worked! The baby moved a bit but we were able to find it a few times and it was music to our ears! At first we didn't know if we found it or not but there's a pretty clear distinction between ur own heart beat once you find the baby's. Worth the $20 for sure! I highly recommend every expecting mother have one! ☺️💗💙🍼