When did you really start noticing symptoms?

Right now I'm in the middle of my 6th week, and other than occasional cramps I haven't really noticed much in the way of symptoms. I expected to have severe morning sickness almost immediately, since I get motion sickness and hangovers so easily, but so far no nausea. I'm sure it's fine, since some people don't even realize they're pregnant at 6 weeks- and I'm not going to complaint about NOT feeling nauseous