DH has an arrythmia (and a bunch of other heart stuff, Dr's look truly scared of him when he explains it) and he said that it's when it's unusual that you should go check it out, although he was also told that the only thing to really worry about was if you had an infection and it got to your heart (that could just be his heart thing though).
So, getting it checked by a cardio sounds like a good plan, but not a reason to freak out. It's really good that you've gotten on top of it already, I hope you get told something extremely reassuring!