Nausea from pregnancy (often called morning sickness) usually starts about 4–6 weeks after conception for most people, not immediately.
Typical timing
- Many sources note that nausea commonly begins around pregnancy week 6, which is roughly 4 weeks after conception.
- Some describe symptoms starting a bit earlier, around week 5 of pregnancy (about 3 weeks after conception).
Earliest possible onset
- A small number of people report feeling nausea as early as about 2 weeks after conception, around the time of an expected missed period, but this is less common.
- Before about 1–2 weeks after conception, it is very unlikely that nausea is due to pregnancy because hormone levels are usually not high enough yet.
When to seek help
- If nausea is severe (you cannot keep fluids down, you feel dizzy or faint, or you have very little urine), contact a healthcare provider to rule out hyperemesis gravidarum and dehydration.
- Even with milder nausea, a clinician or midwife can suggest safe strategies or medications to help you feel better in early pregnancy.
