Normal?

Everything I read about being 5 weeks pregnant has morning sickness as one of the top symptoms. Here and there I'll feel a little sick to my stomach especially after eating, but I'm never nauseated or feel like I'm going to puke. I've read that morning sickness is usually a good sign, meaning everything's going how it should. I'm probably just over thinking everything because I just want everything to go perfect and to have a healthy baby. But does anybody know if it's normal to not experience morning sickness during week 5?