Bought some premixed HCG and decided to try a pregnancy test on it and it came up negative. Does premixed HCG still pass pregnancy tests considering they are mixed specially so they last longer? Another problem I had was that I had some in powder form which I mixed up from bacteriostatic water and it still came up negative. The powder hasn't expired and both brands are different. The source is the same but I am pretty sure they were not sold as fakes. Should I trash the HCG I have and look for a new source?