I get that same rhythm sometimes, and mine was caught on a heart monitor!! It was short runs of SVT! So that's nothing to worry about
I get the occasional run of NSVT, which to me feels like 5 or 6 premature beats in a row with no normal beat in between!!
You could ask your doctor for a 24 hour heart monitor just to be sure!
But it does sound like short runs of SVT
Take care x