Is it normal to get heart palpitations every now and then?

This is something that’s been happening to me ever since I was quite young. Every now and then what happens is that I feel an odd beat in my heart and it makes me have the urge to cough. It’s no more than a second or two and that’s how it’s always been. It doesn’t seem to correlate with whether I’m doing physical activity; it usually happens when I’m just sitting still.

I’ve just always wondered about this. I was worried about it when I was about 14 or so, I did tell a doctor and I had an EKG done, but nothing abnormal was found. Sometimes I go months without this happening, but other times it will happen a couple times in one day.

Does anyone else get this? Should I be concerned?