I have some glass ampules that have sustanon in them and are 250mg each. I want to keep my weekly dose at 500 mg. I plan on injecting mon, wed, fri ,and my question is.... is it safe to store the left over sustanon in a syringe for 2 days untill the next injection day.(as in about 175 mg out of the 250 on monday then will have 75mg left over)