Could my vitamins be causing diarrhea?

Thursday I started taking 2 multivitamins ( I had been taking liquid centrum), Sublingual b12, iron, and calcium. Friday, the diarrhea started and hasn't stopped...I was just awoken by it...again. The only changes I have made are taking multivitamins in pill form, and adding the iron, b12, and calcium. If it is due to my change in vitamins, then what? The b12 is from GNC (sublingual) and the rest is from vitalady. Any help would be MUCH appreciated!!! Thanks!

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