Occional heart palpitations...6 weeks pregnant. Is this normal should I call the Dr?

So I literally just had it happen right before I typed this; and I've had it a couple times in the last few weeks. I'm callin them heart plapitations but that may not be the accurate name for what I feel so I'll describe it. I will all of the sudden get this feeling like my heart is beatin super fast and sort of "fluttering" it will only last for a few second no more then like 10 seconds. And like i said it's only happened about 3 times ever in the last 3 weeks. I am 6 weeks prego today. I'm only 20 and generally healthy. i'm certainly not obese or "over weight" I'm sure I could fair to lose 5 lbs just to be a bit healtheir and towards my optimal weight. Both my parents have had heart probs. My dads resultin from weiht gain after a car accident my moms due to weight gain ociated with hypothyroidism. Is this normal? should I call the Dr? It doesnt happen any specific time like when I'm doing more or less activity. Currently I'm just sittin on the couch but the last time it happened I think I was for a walk.