Eye twitching?!

My eye has been twitching on and off for about the past week and it's so annoying! I asked my sister about it (she's a nurse) and she thinks it could be an electrolyte issue and I need more calcium and magnesium. I've been taking prenatal vitamins daily since before I conceived, and I was under the impression that has everything I need when combined with my relatively okay diet.

Anyone else have this issue?