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Pregnancy symptoms by trimester: what to expect

Pregnancy symptoms change as hormones shift, the uterus grows and your baby develops. The first trimester often brings fatigue, nausea and breast changes; the second may bring more energy, a growing bump and first movements; the third commonly adds pelvic pressure, breathlessness and sleep difficulty. Experiences vary, and severe or sudden symptoms deserve medical advice.

Pregnant woman showing the stages of a growing bump across three trimesters
Written by HelloMommy editorial teamUpdated Published 4 min read

First trimester symptoms: weeks 1–13

The first trimester runs from the first day of the last menstrual period through 13 weeks and 6 days. Rapid hormonal change can create strong symptoms before there is a visible bump, but having only a few symptoms can also be normal.

  • A missed period, light spotting or mild cramping around implantation
  • Tender or fuller breasts and darker areolas
  • Fatigue, emotional changes, headaches or dizziness
  • Nausea, vomiting, food aversions or altered taste
  • Frequent urination, bloating, constipation or heartburn
  • Increased vaginal discharge without a strong smell, pain or itching

What may help in the first trimester

  • Eat small, regular meals and sip fluids if nausea is making full meals difficult.
  • Build in extra rest and keep activity gentle and regular if your clinician has not advised otherwise.
  • Increase fibre and fluid gradually for constipation.
  • Arrange prenatal care and ask about folic acid, vitamin D and any medicines or supplements.

Second trimester symptoms: weeks 14–27

Many people find nausea and fatigue ease in the second trimester, but this is not guaranteed. The uterus rises out of the pelvis, the bump becomes more visible and you will usually begin to feel your baby move between 16 and 24 weeks.

  • A growing abdomen and possible stretch marks or itchy skin
  • Round-ligament pain: brief pulling or sharp pain at the sides of the lower abdomen
  • Backache, pelvic discomfort or leg cramps
  • Skin darkening, including a line on the abdomen or patches on the face
  • Nasal congestion, gum sensitivity or occasional nosebleeds
  • Mild swelling of feet and ankles, especially later in the day

What may help in the second trimester

  • Use supportive shoes, change position often and avoid long periods of standing.
  • Move slowly when turning or standing if ligament pain is triggered by sudden movement.
  • Moisturise itchy skin and tell your clinician about intense itching, especially on palms or soles.
  • Start noticing your baby’s usual pattern once movements become established.

Third trimester symptoms: week 28 to birth

As your baby gains weight and the uterus occupies more space, pressure symptoms often increase. Some are uncomfortable but expected; others overlap with pregnancy complications, so report anything severe, sudden or unusual for you.

  • Strong baby movements and changing sensations as the baby’s position shifts
  • Breathlessness, heartburn and feeling full quickly
  • Backache, pelvic pressure and more frequent urination
  • Sleep difficulty, vivid dreams and fatigue
  • Braxton Hicks practice tightenings that are usually irregular
  • Colostrum leaking from the breasts and gradually increasing vaginal discharge

What may help in the third trimester

  • Eat smaller meals, remain upright after eating and avoid personal heartburn triggers.
  • Rest on your side and use pillows to support your bump and legs.
  • Balance rest with gentle movement and pelvic-floor exercises if suitable for you.
  • Learn your maternity unit’s advice about labour, waters breaking and reduced movements.

Symptoms vary from one pregnancy to another

A symptom checklist cannot show whether a pregnancy is healthy. Symptoms may come and go, and two pregnancies in the same person can feel very different. Prenatal appointments, recommended screening and speaking up about concerns are more reliable than comparing yourself with someone else.

Frequently asked questions

Which trimester has the most symptoms?

There is no universal answer. The first trimester often has the strongest hormonal symptoms, while the third can bring more physical pressure and sleep problems. Severity varies from person to person.

When do first trimester symptoms ease?

Nausea and fatigue often improve between about 12 and 20 weeks, but they can end earlier, later or continue. A sudden change alone is not a diagnosis; contact your clinician if you also have pain, bleeding or feel unwell.

When will I feel the baby move?

Most people first notice movement between 16 and 24 weeks. Tell your midwife if you have not felt movement by 24 weeks, and call immediately if established movements reduce, change or stop.

Are cramps normal during pregnancy?

Mild, brief cramps can occur as the uterus grows or because of constipation. Severe, persistent or one-sided pain, or pain with bleeding, fever, dizziness or shoulder pain, needs urgent medical advice.

Sources

This article is for general information only and is not medical advice. Always talk to your doctor or midwife about your own pregnancy.

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