see? i get that. it started a few years ago like that, and both times i was pregnant it got super bad. now i get them way more often than before i had my kids but i really feel like it may be vagal afib. no doctor has taken me seriously yet. im "too young"
Skipped heart beats, or extra or double... heart beats are common if they occur only occasionally.
Given you have been checked out by a doctor, I'd say you need not be concerned. If the symptoms become troubling talk to your doctor about taking some medication to gain some reduction in symptoms. Best, I think, is to learn to live with them without taking any medications.
Do try to see if there is any pattern, such as diet (eat/drink), or emotional stress, or sleep problems that relate to the palpatations. If you can make a connection, try to stop whatever it is that is causing the palps.
Good luck,