Morning Sickness (First Trimester)

By trimester

Weeks 1–13

1st trimester

This is when morning sickness usually shows up, often starting around week 4 to 9 and peaking near week 7 to 12. Small, frequent meals, ginger, and vitamin B6 are reasonable first steps, and your provider can help if nothing seems to settle your stomach.

Weeks 14–27

2nd trimester

Most women start feeling noticeably better as the second trimester begins, often around week 14 to 16. If nausea hasn't let up at all by now, or you're still losing weight, it's worth a closer look with your provider instead of waiting it out.

Weeks 28–birth

3rd trimester

New or returning nausea this late is less typical for plain morning sickness, so it deserves a second look since it can point to something else, like reflux or a pregnancy complication. Mention any third-trimester nausea to your provider so they can check what's behind it.

What does the evidence show for morning sickness?

• About 8 in 10 pregnant women feel queasy or throw up in early pregnancy, and symptoms usually start around week 4 to 9 and peak near week 7 to 12. 1
• Vitamin B6 is one of the few remedies ACOG specifically calls out for pregnancy nausea, and about 1.9 mg a day is the standard amount recommended during pregnancy. 2
• Nausea and vomiting affect 70 to 80 percent of pregnancies, and only a small share of those cases turn into the more severe, medically recognized form called hyperemesis gravidarum. 3
• Getting ahead of nausea and vomiting early matters, since symptoms that go unmanaged tend to get harder to control and are more likely to end in a hospital visit. 4
• Most morning sickness fades by the end of the first trimester, but for some women it lingers into the second or third trimester and can call for medical care beyond home remedies. 5
• Hyperemesis gravidarum, the severe form of pregnancy nausea, is generally marked by ketonuria and a loss of at least 5 percent of pre-pregnancy weight, along with dehydration and electrolyte disturbances. 6

When should I call my provider about morning sickness?

Call your provider the same day if you cannot keep fluids down, are losing weight instead of gaining it, or feel faint, dizzy, or unusually weak, since these can point toward hyperemesis gravidarum, the more severe form of pregnancy nausea that affects roughly 3 in 100 pregnancies. Hyperemesis gravidarum is generally marked by a loss of 5 percent or more of your pre-pregnancy weight along with ketones in the urine from your body running short on fuel. When nausea and vomiting stop you from eating, drinking, sleeping, or getting through your day, hospitalization for IV fluids and nutrients sometimes becomes necessary, so do not wait it out on your own. None of these lists replace your own judgment: if this symptom worries you, that on its own is enough reason to check in with your healthcare provider.