I am a long retired airline pilot. I needed three ablations in retirement before the cardio cracked it back in 2010. Since then I have had one run of what could have been atrial fibrillation ( the pulse was irregular for a couple of hours) following eating something very cold (ice cream).
Since then, apart from the odd extra, ectopic, beats it has been like clockwork.
So, with luck, your irregular run could have been a "one off" and not necessarily atrial fib.