Congratulations on your pregnancy. Don't worry about how your pregnancy differs from anyone elses, every pregnancy is different, as you may notice if you have more than one. With my first son I was sick just once, with my second son I was sick until 30 weeks. And it's not just sickness (or lack of it), you may or may not get backache, boob ache, tiredness, loss of sex drive, boost to sex drive, a big bump, a small bump, etc etc etc. Remember each pregnancy is unique and you should enjoy it as such.