Twitching eye.

Before anyone starts bashing saying ask my doctor. I WILL ask her at my next appointment on Monday. But right now I want to know if anyone have experienced this before or know why this is happening. I am currently 35 weeks pregnant and for the past 2 weeks my left eye has been twitching pretty much everyday sometimes a few times in one day. Have this happened to you before or do you know why this could be happening?? TIA