someone please talk me off the ledge!

I am having a full blown panic attack. Just left clinic and found out our IUI is scheduled for this weekend. It's our first time. I was wandering around and saw the sheer quantity of samples and Petri dishes and everything they have and I'm freaking out that they will mix up my hubs sperm and use the wrong one!!! I've read about this , it can happen! Anyone work in this area? Do they have measures to make sure this won't happen. I want to abandon the whole idea