This actually happens more than you think. Sometimes you run low last year and don't remember till the next year and have to wait for an order. But just to be clear you have a 3 month window where you can give any of those 3 months. It's kind of frowned upon to jump months for no reason. However it's not illegal and is perfectly normal in that situation.

3 months window includes the current month. We can do any inspection inside thay window. So say it's January I can do January February and March in that time frame. I can't do an April tho. That illegal to jump that far out. Hope this helps. Also your stickers aren't tied to anything. So say you forgot next year and don't notice till March. We'll then you get a 3 it's no big deal.