pinning hcg 250iu twice a week throughout my cycle, has gone flawless so far. just started week 8 and the hcg has burned for the last two pins (today[monday] and last thurs) you think it has gone bad? the first time it burned I thought maybe I just injected in a bad spot but it happened again today. It takes a few minutes then it starts burning, doesnt last long but a dull pain lingers for a while. I felt nothing previously. It has been refrigerated since day 1, sterile vial with bac water...I had planned to use it for 8 weeks after which I have a second vial to mix up fresh, so its not a big deal, but I would like to stretch it one more time if possible/safe. any thoughts? thanks.