What happens when your drawer is short?

my drawer was short $11 today and I’m kinda scared what will happen. My manager told me this is the first time it has ever happened, and I offered to pay it but they said they can’t allow that. I think the reason is maybe when we were having a rush and so much was happening at one time. I had to check online orders, pack, ring up. it’s too much for me especially cause I was cashier from 11-9 today. I’m hoping the consequences aren’t severe… because I didn’t mind paying but they said they have to report it to the GM.