And among women who report symptoms, there is a huge variation in severity. For many women, a few weeks of nausea will precede the onset of vomiting. A few unlucky women do have nausea throughout the pregnancy, and a few have nausea return in the final weeks of the pregnancy. Only you can answer that. Well, not necessarily.
Every pregnancy is a bit different.
Several studies have demonstrated that women with no symptoms of nausea or vomiting do experience a significantly greater proportion of miscarriage. But most women have live births, so lack of symptoms should not be cause for alarm. Beyond that, nobody really knows. There hasn't been a lot of research. The physiological mechanism isn't anything real obvious, but rather a complex interaction.