I am getting an extra heartbeat every so often. my blood pressure is normal. should i be concerned?

Yes: You need to be evaluated with cardiac studies, starting with an keg and possibly a prolonged ekg called a holter monitor. Causes of irregular heart beat can be as simple as a vitamin or mineral deficiency , thyroid problems, or can be signs of cardiac problems. Consulting your physician is best not only for determining the cause, but also for treating it appropriately.