Nausea in pregnancy (often called “morning sickness”) can start surprisingly early: as early as 4–5 weeks of pregnancy for some people, but more commonly around 6 weeks, and usually before 9 weeks.

When nausea usually starts

Most medical sources describe a similar pattern for how early nausea can start in pregnancy.

  • Common start: around 6 weeks of pregnancy, shortly after a missed period.
  • Earliest reported: some people feel nausea as early as 4 weeks, about 2 weeks after conception.
  • Typical clinical range: nausea and vomiting of pregnancy usually begin between 4–9 weeks.

How long it lasts

Once it starts, the course is fairly predictable for many, though not everyone.

  • Peak intensity: often between weeks 7–10 or 8–11.
  • Common end point: improves or resolves by 12–14 weeks for most.
  • Longer-lasting cases: up to 15% may have symptoms to 20 weeks or even until delivery.

What it feels like day to day

The term “morning sickness” is a bit misleading; it can strike at any time of day.

  • Some feel mild queasiness off and on, others have all‑day nausea.
  • Triggers can include smells, certain foods, or going too long without eating.
  • A smaller number develop severe, persistent vomiting (hyperemesis gravidarum), which needs medical care.

When to talk to a doctor

Early nausea is usually normal, but there are times to get checked.

  • If you cannot keep fluids down for 24 hours or more.
  • If you have signs of dehydration (dark urine, dizziness, very dry mouth) or weight loss.
  • If nausea suddenly becomes much worse after previously improving.

Quick Scoop: key takeaways

  • Nausea can start as early as 4–5 weeks , but most often begins around 6 weeks of pregnancy.
  • It usually starts before 9 weeks and tends to ease by the end of the first trimester.
  • Severe or worsening nausea, especially with dehydration, should be evaluated promptly.

Information gathered from public forums or data available on the internet and portrayed here.