I've had (what I think are) PVCs most of my adult life. They come and go. Sometimes years between episodes. I've found that days after strenuous exercise, or excessive stress will cause them to appear.
However, lately, I've been getting them despite no abnormal levels of physical activity, and virtually no stress (have been retired for the last 5 years, and life is good).
So I purchased the AliveCor single-lead ECG. During an episode today, It recorded the PVCs happening every third beat. The sensation of a skipped beat is ugly, distracting, and weakening - almost breath taking. I've been assured by my wife - an ED MD - that unless it's every other beat, and consistently so, it is benign. That's easy to say when you're not feeling it.
I'm posting this here (first post) not because I don't trust her, but they always say, a doctor who is his own doctor (or his family members doctor) has a physician for a fool...
I've added a screen shot of the ECG and highlighted the PVCs... I'm sure that's overkill, but for the uninitiated, it's there.