Baby scope Doppler app???

Lindsay • 30 years old,2 daughters 11 and 10 to a previous! 1 AngelBaby baby #3 after ttc 4 years! Love my Liam lots xxxx
Anybody have this app? Very good ratings in the App Store, I am 6 weeks 1 day and tried this tonight and am sure I heard the faintest heart beat! Xxx