I have some bottles of Fertagyl (vet) HCG. It says 5Ml and 100 ug(?) per ml. I checked their website and it says 0.1mg/ml. I am wondering how this compares to the stuff that is 2000 or 5000ui's. Is this stuff 500 ui worth or what?? It does not say ui anywhere on the bottle so I am not sure.