It can, especially in the setting
of adrenaline (and
the body ejects adrenaline
in the setting
of stress, irregular/unhealthy
meals, etc). This is called a PAC (premature atrial complex) and it's nothing to worry about.
Try to forget this, if you are very anxious you can see a doctor, but if you're feeling well, and you don't get the premature beats constantly, you don't have to. I would probably recommend it anyway, just to get this out of your mind.