Irregular heart beat

Hi girls, have any of you experienced what feels like a flutter in your chest constantly after becoming pregnant? I'm 5 weeks now and it's been happening for about 3 days.. but it is almost constant.. happens several within 15 mins. I had a very infrequent experience with this in the past and my dr. Told me it was probably a PVC and not to worry unless it happened all the time.. but it's kind of freaking me out. Is this common?! Have a Dr apt. For monday.