Home Doppler

Katie • High school sweethearts! We have been together since 10.19.07 (Married since 10.19.13).We have 1 Angel baby❤ March2016. 1 Girl 02.07.17, 1 Boy 05.18.18, & Girl 04.07.22
My MIL gave me a home doppler a while ago "for when I got pregnant". I am only 5wk5ds but I am dying to be able to use it! Have any of you used one? If so how early were you able to find the heartbeat? I have heard 7wk4ds was the earliest so far.