Novarel trigger question ?

Has anyone triggered with Novarel before? Last cycle I had 10,000usp of novarel and they mixed it gave administered it then gave me left over to bring back for a booster trigger a week later.

This cycle I need to do it myself because of IUI timing and they only gave me 5000usp novarel. I have 1.5cc’s drawn up in a syringe to inject tonight and I have 1/2cc left in the vial to bring back for a booster. I’m just confused why my dose was lowered and of course didn’t think to ask but now of course I’m freaking out it won’t be enough