Nausea in pregnancy (often called “morning sickness”) most commonly starts around 5–6 weeks of pregnancy, but it can begin a bit earlier or later depending on the person. Many people notice it shortly after a missed period, and it often peaks around weeks 8–10 before easing by about 12–14 weeks.

Typical start time

  • Most medical sources say nausea usually starts before 9 weeks , often around week 5 or 6.
  • Some recent research that timed symptoms from ovulation suggests nausea can begin as early as about 8–10 days after ovulation (roughly 3–4 weeks pregnant), which is earlier than traditionally thought.

How early can it start?

  • A small number of people report queasiness even before a missed period , likely due to rising hormones like hCG and estrogen.
  • Most, however, begin to feel symptoms between the 4th and 6th week , with at least 70% of pregnancies having some degree of nausea.

How long does it last?

  • For many, nausea improves by 12–14 weeks of pregnancy.
  • Some continue to have milder nausea into the second trimester, and a small number may have symptoms throughout pregnancy.

When to contact a doctor

  • Call a healthcare provider urgently if you cannot keep fluids down, are vomiting many times a day, are losing weight, or feel signs of dehydration (very dark urine, dizziness, dry mouth). These can suggest severe nausea called hyperemesis gravidarum , which needs medical treatment.

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Wondering how early in pregnancy nausea starts? Learn when morning sickness usually begins, how early it can show up, how long it lasts, and when to call a doctor.

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