So I completed my first batch of homebrew this morning, but I forgot one potentially (okay, not potentially, definitely) important aspect of the whole process: the yeast. I didn't forget it, per se, but I forgot that I was supposed to smack the smack pack three hours in advance (per the instructions on the Wyeast Activator package, it says three hours in advance or pitch immediately). Being a beer wunderkind, I split the difference and smacked it 90 minutes before pitch time. It had expanded some before I pitched it, but it wasn't quite full. Should I be concerned? More importantly, if I don't see fermentation activity in the next 24-36 hours, can I just put in more yeast (properly prepared this time)?