Heart rate dopplers

KW • Mommy to two sweet daughters and pregnant with a 3rd baby! (don`t know gender yet)
Does anyone else think it's not the best idea to use them on your own? No one fully knows the affects they cause to the baby and it would definitely make me MORE nervous if I wasn't able to find the heart beat right away. I know this is probably an unpopular opinion but after seeing so many posts about them had to throw it out there. No offense to anyone that uses them - I really do understand wanting to make sure everything is ok!