My mom and I have an app on the iPad and iPhone that lets you listen to the heart beat. We've been listening to it since the day I got here. Baby stayed in the same place. Yeah well tonight monkey decided to prank us. The baby moved from being below my belly button to being above it. I made a face and said " alright this isn't funny!" Then moved the iPad and said there is my little monkey!
Nope it worked for me at 12 weeks.