I have had snapshot ecgs in a clinic, am waiting for a 24hr one. I feel my heart fluttering and thudding all the time. Someone said to get an app that you put your fingertip over the camera and flashlight and it gives a basic read. I did that, watched it for ages and every time I felt the flutter and thump, the rhythm changed. This is what one of these strange beats looks like. I've attached an image of the normal rhythm before it and then the strange one.
What is it likely to be?