I was shorted some pain meds by my pharmacist?

I had an injection in my knee Monday and was given some pain meds to help me thru the initial discomfort. The doctor prescribed 40 Lortabs so I took it to my pharmacist to have it filled, picked up the prescription and proceeded to go out of town. Tonight I was taking one out of the bottle and accidentally dropped the bottle on the floor and some of the pills fell out. It was then I realized that what I had left vs. what I had taken did not match up and I realized that I was shorted 10 pills - I was prescribed 40 and got only 30. I don't know if I should bring this to the attention of my pharmacist or not because it is a pain medication and I have no way of proving this. I'm sure about this because I keep up with how many meds I'm taking and when I take it. I'm a very honest person, but I don't want to sound like I'm trying to get more pain meds, but I also may need them down the road because my knee has been giving me alot of problems. Also, I'm out of town and can't even take the bottle back to the pharmacist until Monday. Should I call my pharmacist and bring this to their attention or just let it go?