My wife is pregnant !! help?

newly weds, and around 9 wks pregnant. she is tired alot which i have been told is normal. irritable and snappy. i understand all of that, but she is not very affectionate towards me. is that normal, or is this change going to last from now on. she has also had alot of morning sickness. i have heard of post pardom and terrible changes after the baby has been born, but what about now before its here. ?? i cant remember--what's that. will that get better.