Free family guide · Early pregnancy

Early signs of pregnancy

The National Institutes of Health (NICHD) says a missed period is the main sign of pregnancy.[1] It also says symptoms vary and do not confirm a pregnancy by themselves.[1]

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Sources on this page: NICHD; OWH; MedlinePlus; CDC

This page shares what health organizations say. It is not medical advice. It is general information. Talk to your doctor, midwife or pediatrician about your own situation.

In an emergency, call 911.

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Common early signs

NICHD lists these other early signs:[1]

  • light spotting;[1]
  • sore breasts;[1]
  • tiredness;[1]
  • headaches;[1]
  • nausea, at any time of day;[1]
  • cravings for some foods, or turning away from others;[1]
  • mood swings;[1]
  • needing to urinate more often.[1]

A missed period has other causes too

NICHD says a missed period can also come from birth control, diabetes, polycystic ovary syndrome (PCOS), eating disorders and some medicines.[1]

How to find out

NICHD says to see a health care provider, because symptoms alone cannot confirm a pregnancy.[1]

The Office on Women's Health (OWH) says home pregnancy tests look for a hormone called hCG in urine.[2] It says results are more reliable about a week after a missed period.[2]

Symptoms in the first trimester

OWH lists tiredness, tender breasts and nausea, with or without vomiting, as common changes in the first trimester.[3]

MedlinePlus says hyperemesis gravidarum is extreme, lasting nausea and vomiting that can cause dehydration and weight loss.[4] It says to call a provider if you cannot keep fluids down for more than 12 hours, feel dizzy, see blood in vomit, have belly pain or lose more than 5 pounds.[4]

When to get care right away

CDC lists vaginal bleeding or leaking fluid during pregnancy, and severe belly pain that does not go away, among its urgent maternal warning signs.[5]

MedlinePlus says some people spot in early pregnancy and do not miscarry, but any bleeding should prompt a call to a provider.[6]

MedlinePlus says early signs of an ectopic pregnancy may include light bleeding and pelvic pain.[7] It says an ectopic pregnancy can be a medical emergency.[7]

Questions families ask

What is the first sign of pregnancy?

NICHD says a missed period is the main sign of pregnancy.[1]

Can symptoms tell me for sure that I am pregnant?

NICHD says symptoms vary and do not confirm a pregnancy by themselves.[1] It says to see a health care provider.[1]

What else can cause a missed period?

NICHD lists birth control, diabetes, polycystic ovary syndrome (PCOS), eating disorders and some medicines.[1]

When is a home pregnancy test more reliable?

OWH says results are more reliable about a week after a missed period.[2]

Free from UpOnly Learning. Written for families of every faith. No outside ads and no affiliate links. Every fact on this page comes from the sources listed below. How we source and review these pages

Updated 2026-10-24: first published.

Sources

All sources were opened and checked on the date shown.

  1. Eunice Kennedy Shriver National Institute of Child Health and Human Development (NIH). What are some common signs of pregnancy?. Checked October 24, 2026.
  2. Office on Women's Health (HHS). Knowing if you are pregnant. Checked October 24, 2026.
  3. Office on Women's Health (HHS). Stages of pregnancy. Checked October 24, 2026.
  4. MedlinePlus (National Library of Medicine). Hyperemesis gravidarum. Checked October 24, 2026.
  5. Centers for Disease Control and Prevention (HEAR HER campaign). Urgent Maternal Warning Signs and Symptoms. Checked October 24, 2026.
  6. MedlinePlus (National Library of Medicine). Miscarriage. Checked October 24, 2026.
  7. MedlinePlus (National Library of Medicine). Ectopic Pregnancy. Checked October 24, 2026.