Are some of us just lucky to have a relaxing pregnancy?

I'm calling it a relaxing pregnancy because I'm almost 4 months pregnant and haven't gotten any morning sickness at all. The only symptoms I ever had was a tiredness once in a while and a slight increased in appetite. That's it but no vomiting.

I've already searched this and it said that 70% of women will experience morning sickness while 30% doesn't. Are we among the fewer lucky ones?

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I'm beginning to think perhaps the dietary lifestyle (I've always liked vegetables and eat more poultry and fish than meat), never smoked in my life, always drink water and not getting too stressed out might have something to do.
Are some of us just lucky to have a relaxing pregnancy?
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