Pregnancy Symptoms by Week (1–40)
Pregnancy symptoms can vary widely from person to person and week to week. Some people notice symptoms very early, while others may not feel pregnant for several weeks. Understanding pregnancy symptoms by week can help you know what’s normal, what to expect next, and when to contact a healthcare provider.
This guide explains common pregnancy symptoms throughout all stages of pregnancy, grouped by trimester, with helpful tips and medical context.
Pregnancy Symptoms by Trimester
Weeks 1–4: Very Early Pregnancy Symptoms
During the first few weeks, symptoms are often subtle and easy to miss. Many people don’t yet realize they are pregnant.
- Missed period
- Light cramping or implantation bleeding
- Fatigue or low energy
- Breast tenderness or swelling
- Mild nausea or food aversions
Learn more about early development in Pregnancy Week 4.
Weeks 5–8: Hormonal Changes Intensify
Hormone levels rise rapidly during this period, and symptoms often become more noticeable.
- Nausea or morning sickness
- Heightened sense of smell
- Frequent urination
- Mood swings
- Increased fatigue
Read a detailed breakdown in Pregnancy Week 5.
Weeks 9–13: End of First Trimester
Symptoms may peak toward the end of the first trimester, especially nausea and fatigue.
- Morning sickness (may peak)
- Headaches
- Constipation or bloating
- Food cravings or aversions
Weeks 14–27: Second Trimester Symptoms
Many people feel better during the second trimester as energy returns and nausea improves.
- Increased energy
- Growing belly and weight gain
- Baby movements (quickening)
- Back pain or round ligament pain
- Skin changes such as stretch marks
Weeks 28–40: Third Trimester Symptoms
As your body prepares for delivery, physical discomfort may increase.
- Shortness of breath
- Swelling in feet and ankles
- Heartburn
- Frequent urination
- Braxton Hicks contractions
When Pregnancy Symptoms Are Normal vs Concerning
Many symptoms such as mild cramping, nausea, or fatigue are normal. However, you should contact a healthcare provider if you experience:
- Heavy bleeding
- Severe abdominal pain
- High fever
- Persistent vomiting
- Sudden swelling or severe headaches
When to See a Doctor
If you have a positive pregnancy test, most providers schedule the first prenatal visit around weeks 6–8. Seek medical care sooner if symptoms feel severe or unusual.
Helpful Tools
This content is for educational purposes only and does not replace professional medical advice. Always consult your doctor, midwife, or healthcare provider for guidance during pregnancy.