I bought some premixed 10,00iu HCG (didnt know, and it didnt say it was premixed oh well) So it came as a 10,000iu /1ml water. I have heard from some people however that the premixed HCG bottles come with sodium chloride that only lasts a week. I was planning on mixing it with bac water later for accurate draws but its just been chilling in my fridge for about 3 weeks since I dont need it yet. Is my HCG worthless now or what?