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What Are The Common Early Symptoms of Pregnancy?

by Samaira Farid,
Dr Shree Datta
Medically reviewed by Dr Shree Datta
Pensive young lady sitting outside with a journal on her lap and a pen in her hand
Bloume content relating to health, wellbeing and nutrition has been reviewed and validated by relevant medical professionals in the UK, based on UK guidelines and practices applicable at the time of publication. Recommendations in other localities may differ from those found on our site and you should always seek the guidance or advice of relevant healthcare professionals in your area.

Early pregnancy symptoms can arrive quickly and feel unfamiliar, even if you have experienced premenstrual symptoms before. Deep tiredness, nausea at any hour, and breast tenderness that feels different from your usual premenstrual ache are among the most common, and all of them are your body responding to a fast hormonal shift that begins within days of conception. The first trimester covers the start of pregnancy through to the end of week 12.2

The hormones behind early pregnancy symptoms

Much of what you feel early on traces back to one hormone. Soon after conception, your body starts producing human chorionic gonadotropin (hCG), often called the pregnancy hormone. Its levels climb fast in early pregnancy, peaking at around nine weeks. That rapid rise drives a lot of the symptoms you feel in the first trimester, nausea included.3

Oestrogen and progesterone both climb steeply during early pregnancy. Progesterone softens the muscles of your womb so it can expand, keeps the pregnancy going until the placenta takes over, and relaxes the muscles of your digestive tract (which is part of why bloating and heartburn can creep in). At the same time, rising oestrogen works alongside progesterone to increase blood flow to the womb, support the growing uterine lining, and prompt structural changes throughout your body. Together, these hormonal shifts drive early physical symptoms while creating the environment your pregnancy needs to thrive.4

What is normal in the first trimester?

Nausea and vomiting, often called morning sickness, affect up to 80% of pregnant women. The name is misleading, because it can catch you at any time of day or night. It usually starts somewhere between weeks four and seven, and for most people eases by around 20 weeks.5

Other physical changes you may notice

Beyond nausea, plenty of other changes are typical in the first trimester:

  • Tender, larger breasts
  • Needing to wee more often
  • Constipation
  • Changes in vaginal discharge
  • A metallic taste in the mouth
  • A sharper sense of smell
  • Food cravings and aversions6

Not noticing a particular symptom on this list does not signal a problem. Every pregnancy is different, and which symptoms show up, and how strongly, varies widely.

Where the pain tends to be in early pregnancy

Mild stomach cramps, sometimes described as period-like pains or growing pains, are common early on. They can come from ligaments stretching to support your growing womb, from constipation, or from trapped wind, and usually ease when you rest or change position. However, if the pain is severe, persistent, or accompanied by bleeding, seek medical advice promptly. Severe or prolonged pain in early pregnancy can be a sign of complications such as an ectopic pregnancy, a threatened miscarriage, or an ovarian cyst issue that needs urgent assessment.17

When to seek support

If you are being sick constantly and cannot keep any food or fluid down, call your GP or midwife. This can be a sign of hyperemesis gravidarum (HG), a severe form of pregnancy sickness that affects up to 3 in 100 pregnant women and sometimes needs hospital treatment. HG can start before 20 weeks and is different from typical morning sickness. If nausea and vomiting are wearing you down, your GP or midwife can offer support, reassurance, and advice on food and fluids. Where medication is needed, they may suggest antihistamines as a first option.8

Call your midwife, GP, or an early pregnancy unit if you have stomach pain alongside any of these:

  • Vaginal bleeding or spotting
  • Regular cramping
  • Unusual vaginal discharge
  • Pain when urinating
  • Severe pain that does not ease with rest9

Frequently Asked Questions

Sources

  • [1] Bleeding and/or pain in early pregnancy

    mild cramps and ligament stretching are common, but emphasizes seeking urgent medical assessment if pain is severe, continuous, or accompanied by bleeding, as it could indicate an ectopic pregnancy, threatened miscarriage, or an ovarian cyst complication.

  • [2] Week-by-week guide to pregnancy

    The first trimester covers the period from the beginning of pregnancy up until week 12. It is a critical time for the baby's development.

  • [3] Week 9 - Your pregnancy and baby guide

    Soon after conception, your body begins producing human chorionic gonadotropin (hCG), often called the pregnancy hormone. In early pregnancy, hCG levels rise sharply, reaching their peak at around nine weeks. This rapid rise drives many of the symptoms you feel in the first trimester, including nausea.

  • [4] Week 9 - Your pregnancy and baby guide

    Progesterone also rises significantly in early pregnancy. Its role is to relax the muscles of the womb so it can expand, and to maintain the pregnancy until the placenta is established. Progesterone also relaxes the muscles of the digestive tract, which can contribute to bloating and heartburn.

  • [5] Pregnancy sickness (nausea and vomiting of pregnancy and hyperemesis gravidarum)

    Nausea and vomiting, often referred to as morning sickness, affect up to 80% of pregnant women. It can happen at any time of day or night. Symptoms typically begin between weeks four and seven, and for most people they improve by around 20 weeks.

  • [6] 6 weeks pregnant guide

    Other common physical changes include tender, larger breasts; needing to urinate more frequently; constipation; changes in vaginal discharge; a metallic taste in the mouth; a heightened sense of smell; and food cravings and aversions.

  • [7] Stomach pain in pregnancy

    Mild stomach cramps, sometimes described as period-like pains or growing pains, are common in early pregnancy. They can result from ligaments stretching to support the growing womb, constipation, or trapped wind. The discomfort is usually mild and may ease with rest or a change of position.

  • [8] RCOG Green-top Guideline No. 69

    Where medication is needed, a GP or midwife may recommend antihistamines as a first option.

  • [9] Stomach pain in pregnancy

    Contact your midwife, GP, or an early pregnancy unit if you have stomach pain alongside vaginal bleeding or spotting, regular cramping, unusual vaginal discharge, pain when urinating, or severe pain that does not ease with rest.

  • [10] Ectopic pregnancy

    An ectopic pregnancy is a medical emergency. It occurs when a fertilised egg implants outside the womb, most often in a fallopian tube, and affects around 1 in 90 pregnancies in the UK. Symptoms include pain in the lower abdomen (often on one side), vaginal bleeding that differs from a normal period, and sometimes pain at the tip of the shoulder.