Can vitamins cause heart palpitations?

I'm 17 and just started taking new vitamins and have some heart palpitations. I'm active, and pretty healthy overall. They worry me and I don't know why I'm getting them. Sometimes my heart beats faster when I've eaten a big meal too. I've been stressed out lately by friends and college plans, school work. What could be wrong and is this normal? Should I stop excercising and working my heart alot because I run about 4-5 times a week or should I increase excercise. Could the vitamins be causing them? I'm takingthe cvs chewable spectravite vitamins.