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Takeaway. 1  The first trimester of pregnancy starts without any signs that youâre pregnant. 2  It ends with a body thatâs adjusted to carrying a child. 3  Noticeable symptoms wonât start until the fourth week.  Morning sickness may begin around week five or six, but nausea and vomiting can happen any time of the day.
Morning sickness, nausea, and vomiting during early pregnancy. Nausea and morning sickness usually develops around the fourth to sixth week. Although itâs called morning sickness, it can occur any time during the day or night. Itâs unclear exactly what causes nausea and morning sickness, but hormones may play a role.