I have had this ever since conception! (I am 10 weeks now) I saw my GP about it and he didn't seem to worried about it. I find it worsens with even a small amount of caffeine (which I know I shouldn't be having). Mine feels like a skipped beat which my GP said that I actually have one fast beat and then one to catch up. It happens about once every 10-20 beats. It drives me bonkers! He basically blammed it on pregnancy and said not to worry Feels so weird though.