Nausea after conception typically starts around 8 to 10 days after ovulation (conception), with symptoms of pregnancy sickness (nausea and vomiting) beginning within a narrow timeframe for most women. Some sources report that nausea usually begins around week 4 to 6 of pregnancy, which corresponds to roughly 2 to 4 weeks after conception, but the earliest onset as close as 8 to 10 days after ovulation has been observed in studies using ovulation as the reference point rather than the last menstrual period. Nausea usually peaks around weeks 8 to 11 and tends to fade by the end of the first trimester (around 12 to 14 weeks), though some women may experience it longer or even throughout pregnancy in severe cases.
Therefore, nausea can start as early as approximately 8 to 10 days after conception for many women, often before a missed period is detected. However, it is more commonly noticeable by about 4 to 6 weeks of pregnancy.
