Can morning sickness occur as early as 2 weeks?

No, because your pregnancy starts from the first day of your last period. So, when you're two weeks pregnant, that is actually the time when you ovulate and conceive. The reason they count from your period date is because there is no way to tell when you actually conceived, since conception occurs anywhere from a couple of hours to a couple of days after you ovulate.

Morning sickness will not start until a couple of weeks after that, when you miss your next period, and your body begins to produce significant amounts of progesterone.

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