anyone have a fetal doppler? I just got one and I don't have gel but I read you can use lotion. just…

anyone have a fetal doppler? I just got one and I don't have gel but I read you can use lotion. just tried and it's displaying numbers (easily can tell which is me and which is baby) but I don't actually hear the heartbeats, just the wooshing noise of the doppler. would gel make a difference? I hear the louder thud of a kick every so often 😉