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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.
Cause # 6: Pregnancy. The most common endocrinologic cause of nausea is pregnancy. Also known as morning sickness, nausea in the morning is very common in early pregnancy. Nausea and, sometimes, vomiting usually begin before most women are 9 weeks pregnant and clear up between 12 to 14 weeks of pregnancy. It can occur at any time of the day or night and some women feel nauseated all day long.