I Forgot To Get My Keppra Refilled And I Just

I forgot to get my keppra refilled and I just took 1/2 of one I had put away. My pharmacy is not open tomorrow and Walmart's prescription is out of date. Will I be able to make it until Monday morning without it? Will Walmart give me one or two pills tomorrow until my pharmacy opens Monday? I am really sorry I forgot and had to bother you with this but I need your help...Thank you.