For most pregnant people, vomiting stops between weeks 16 and 20 of pregnancy. It typically begins around weeks 6 to 8, peaks somewhere between weeks 9 and 13, then gradually fades as you move into the second trimester. That said, roughly 42% of people with nausea and vomiting during pregnancy experience a prolonged course that stretches well beyond that window, and a small percentage deal with it through delivery.
The Typical Timeline
Nausea and vomiting most commonly appear around week 6, driven largely by rapidly rising hormone levels. Symptoms tend to be worst during the late first trimester, then taper off as the placenta takes over hormone production and those levels plateau. By week 16 to 20, most people notice a significant improvement or complete resolution.
This timeline is an average, not a guarantee. Some people feel better by week 12. Others still feel queasy at week 22. Both are within the range of normal. The pattern also varies between pregnancies: you might vomit daily with one pregnancy and barely feel nauseous with the next.
When Vomiting Lasts Longer Than Expected
About 42% of people with moderate nausea and vomiting experience symptoms that extend past the typical window. Several factors increase the odds of a longer course:
- History of digestive problems. Having a gastrointestinal condition in the year before pregnancy roughly doubles the risk of prolonged moderate symptoms, and increases the risk of prolonged severe symptoms by about ten times.
- Lower physical activity before pregnancy. People who exercised fewer than three days per week before conceiving had notably higher rates of prolonged nausea compared to those who were active most days.
- More sedentary time before pregnancy. Those who spent seven or more hours per day sitting before pregnancy had roughly 1.5 to 2 times the risk of prolonged symptoms.
These are associations, not destiny. But if you had reflux, irritable bowel syndrome, or another gut condition before pregnancy, your body may simply take longer to settle down.
Hyperemesis Gravidarum: The Severe End
Hyperemesis gravidarum is the most severe form of pregnancy-related vomiting, affecting somewhere between 0.3% and 10.8% of pregnancies depending on how it’s defined. It goes beyond everyday morning sickness: people with this condition vomit so frequently that they lose significant weight, become dehydrated, and develop electrolyte imbalances.
Unlike typical morning sickness, hyperemesis can begin before 6 weeks and continue through the third trimester, sometimes lasting until delivery. Signs that vomiting has crossed into this territory include inability to keep any fluids down, concentrated or dark urine, dizziness or fainting, dry skin, and noticeable weight loss. If you’re experiencing these, you likely need intravenous fluids and closer monitoring rather than just waiting it out.
What to Do While You Wait It Out
For mild to moderate symptoms, a few strategies have solid evidence behind them. Ginger, at about 1 gram per day split into two to four doses (roughly 250 mg every six hours), has been shown to reduce nausea and vomiting episodes. You can get this from ginger capsules, ginger tea, or crystallized ginger, though capsules make it easiest to track the dose.
Vitamin B6 combined with an antihistamine found in some over-the-counter sleep aids is the first-line recommendation from the American College of Obstetricians and Gynecologists. The antihistamine component is typically taken as half of a 25 mg tablet (12.5 mg). Your provider can walk you through the specific timing and whether this combination makes sense for your situation.
Smaller, more frequent meals help many people. So does eating something bland before getting out of bed, staying hydrated with small sips rather than large drinks, and avoiding strong smells. None of these are magic fixes, but stacking several small strategies together tends to take the edge off.
Vomiting That Starts or Returns in the Third Trimester
If vomiting comes back after weeks of feeling fine, or appears for the first time late in pregnancy, that’s a different situation than lingering first-trimester nausea. Third-trimester vomiting has its own set of causes that need attention.
Acid reflux is the most common culprit. As the uterus grows and pushes against the stomach, heartburn and nausea become increasingly likely. This is uncomfortable but generally manageable. However, new heartburn or stomach pain in the third trimester can also be a sign of preeclampsia, a serious blood pressure condition. If nausea or vomiting in late pregnancy is accompanied by upper abdominal pain, sudden swelling, headaches, or vision changes, that combination warrants prompt evaluation.
The key distinction: vomiting that has been gradually improving since the first trimester and finally fades in the second trimester is the normal pattern. Vomiting that suddenly appears or worsens after months of feeling well is worth investigating, especially in the third trimester.