Fetal dopplers safe?

Taylor

So im picking up a fetal doppler tomorrow and I know the big thing with them is not to panic if you cant find a heart beat because the baby could be in an off position. My question is are they safe done ive done a ton of research and most things say yes but I also read one where is says it could cause bubbles or effect the fetus. If I did it once or twice a week for 5 minutes will it be safe?