Hi!
If you were my patient, I would advise you that it is completely normal for your second pregnancy to be completely different from your first. Every pregnancy is different. "Morning sickness" can be a good sign of a healthy pregnancy, but many women who have healthy babies don't experience it.
Don't worry if things are different this time around!
Good luck!
Dr B
Every pregnancy is different and so will be your symptoms so I wouldn't worry. I had no symptoms with my first two pregnancies except being tired and then with my last one I had every symptom possible.