I need some quick advice, im doing a mead at the time of this post. I just went to the brew shop today and picked up a wyeast 4632 dry mead smack pack. The mfg is 01/20/09 i activated it 4 hours ago and it hasent swelled at all at room temp. This is the first mead pack i have ever used and all the beer yeast i have ever purchesed has swelled up by this time. Should i use it, could it be a bad pack, im just not shure what to do any advice would be help full thanks.