Dear dee dee,
PVCs and PACs or ectopic beats (whatever you want to term these extra heart beats) are totally benign, but they are not completely understood in that we only know of some things (not all) that spur them on so to speak.
Caffeine, chocolate, alcohol, tea, and stress are all famous for causing the extra beats, but whether you are pregnant or not, they will cause no harm.
If you ever get symptoms of shortness of breath, or chest pain,or passing out sensation then you would need a reevaluation. It sounds as if you have been thoroughly checked out so to speak and you should rest easy that all is well.
Good Luck and write back if you have any further questions.
Information provided in the heart forum is intended for general medical informational purposes only, actual diagnosis and treatment can only be made by your physician(s).