Feeling Hot in Early Pregnancy: Complete Guide
Running warmer than usual is one of the earliest and most common signs that your body is adjusting to pregnancy. Many women notice they're throwing off the duvet at night, sweating more easily, or simply feeling flushed for no obvious reason within the first few weeks. It's almost always a normal part of the huge physiological changes taking place, but it's worth knowing the difference between feeling warm and running an actual fever.
Why you feel warmer in early pregnancy
Progesterone, one of the key hormones that rises sharply in early pregnancy, has a mild warming effect on the body — it's the same hormone responsible for the slight temperature rise some people track when trying to conceive. On top of this, your blood volume starts increasing substantially from early pregnancy to support the growing placenta, and your metabolism speeds up to meet your baby's needs. Together, these changes mean your body is working harder and generating more heat, which is why many women feel warmer, flush more easily, or sweat more than they did before pregnancy.
Ways to stay comfortable
- Dress in layers so you can adjust easily as your temperature fluctuates through the day
- Keep your bedroom cool and use lightweight, breathable bedding
- Use a fan, especially at night if hot flushes are disturbing your sleep
- Drink plenty of cold water — staying hydrated helps your body regulate temperature more effectively
- Avoid hot tubs, saunas, and very hot baths, as raising your core body temperature significantly is best avoided in pregnancy
- Choose breathable, natural fabrics like cotton where possible, particularly for sleepwear
Feeling warm versus having a fever
Feeling generally warmer, flushed, or sweatier than usual is a normal pregnancy symptom and not something to worry about on its own. A genuine fever is different — a temperature of 37.8°C (100°F) or above is generally considered a fever, and this is not a normal part of pregnancy. A fever usually signals your body is fighting an infection, and it's worth taking seriously in pregnancy because untreated infections and high temperatures in early pregnancy can occasionally affect your baby's development. If you have a raised temperature along with other symptoms such as chills, aches, a headache, or feeling generally unwell, contact your midwife or GP.
Frequently Asked Questions
Why do I feel so hot in early pregnancy?
Rising progesterone levels have a warming effect on the body, and your blood volume and metabolism both increase from early pregnancy to support your growing baby. Together these changes commonly make women feel warmer, flushed, or more prone to sweating than before pregnancy. This is a normal and expected symptom rather than a sign of illness.
Can a fever harm my baby in early pregnancy?
A true fever — a temperature of 37.8°C or above — is different from simply feeling warm, and is worth taking seriously because it usually means your body is fighting an infection. Persistent high temperatures in early pregnancy can occasionally be linked to complications, so it's best to contact your midwife or GP if you have a genuine fever, especially alongside other symptoms of illness. Taking paracetamol and seeking advice promptly is the recommended approach rather than waiting to see if it passes.
When should I contact my midwife about feeling hot?
Simply feeling warmer than usual doesn't need medical attention. Contact your midwife or GP if you measure an actual fever of 37.8°C or higher, especially if it's accompanied by chills, aches, a rash, pain when weeing, or you generally feel unwell, as these can point to an infection that needs treatment.
This article is for informational purposes only and does not constitute medical advice. Always consult your midwife or GP about symptoms specific to you.
Related articles: