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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.
During the first trimester of pregnancy, many women experience the bouts of nausea and vomiting known as morning sickness. Despite its name, morning sickness can occur at any time, day or night. It usually begins around the 6th week of pregnancy, peaks around week 9, and disappears by weeks 16 to 18.