I brewed my 3rd batch last night, an IPA. My yeast was an American Ale from Wyeast. The pack expanded while I was brewing and I thought all was OK. However when I went to pitch the yeast I saw that the activator hadn't popped. The little plastic bag had a big bulge in it. I went ahead and popped the activator and let it sit in the bag for a few minutes. It was pretty late, so I went ahead and pitched it in the carboy. I get up this morning and nothing is happening. The bottom of the carboy has what looks like the normal trub in it, but no fermentation. Any suggestions ??