So I went for it and got the 6 lead Kardia since most people thought it would be worth while.
Got it today and on my second ECG, it came up an inconclusive so I done another after which came back as possible A fib. Returned to normal after.
I shall keep going with it for a while and see how often this happens. If it's quite often, I shall try to contact the cardiologist.
I avoid getting obsessive with it, I will aim to just do it when I feel palpitations or have breathlessness for no obvious reason. I imagine it would be quite easy to start checking constantly so I will resist when I'm generally feeling alright