I brewed an oatmeal stout for the first time this past Monday. It's now Friday and I still haven't seen any signs of fermentation. I verified this by taking a hydrometer reading today and there was no change. I do know that when I pitched the yeast it was about 6 deg warmer than the wort. I figured the yeast would b shocked but didn't think it would take this long to respond. At what point do I pitch more yeast or should I just relax and have a homebrew for a while longer?