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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.
Nausea is an early symptom of pregnancy BUT not a âvery. early symptomâ. Nausea typically starts during week 6, that is about Day 42. Before the expected date of periods, that is before Day 28,nausea is not. expected to be a symptom of pregnancy.