Is it normal if "morning" sickness doesn't occur everyday?

Morning sickness : Yes some women have morning sickness every day and some not at all

Absolutely!: Celebrate! Just stay hydrated, get lots of sleep, eat healthily, take your prenatal containing iron and folic acid, and get your routine obstetric care, which is a multi-step process over the course of the pregnancy. No smoking, and no recreational drugs, period. I strongly advise total avoidance of alcohol, but that's a decision you need to make with your personal doc.

Absolutely: It can be regular and irregular, especially depending on the type of foods you are eating talk with your OB