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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.
Around half of all pregnant women experience nausea and vomiting, and around 3 in 10 women experience nausea without vomiting. For most women who have morning sickness, the symptoms start around six weeks after their last period. Read more about coping with nausea and morning sickness in pregnancy.