5000iu

I want to use HCG 500iu/week but i can only get a 5000iu per vial. Can i pre-load syringes, store them in a cooler and use it in 10 weeks?

i want to do 2 shots of hcg 250iu a week while on cycle if i get a 5000iu amp of hcg how do i inject it? how much mls would be 250iu? thanks guys