From early pregnancy symptoms to late discomforts, Dr. Marie K. Grove shares what happens in your body week by week as hormones shift and the baby grows – plus when to contact your OB.
Body changes during pregnancy can start very early, sometimes before you even begin to show. Throughout your pregnancy, your body will adapt in remarkable ways to support your growing baby. Hormones rise quickly, blood volume increases, ligaments loosen, and the uterus expands to make room for your baby. This full-body takeover is one reason body changes during pregnancy week by week can feel so noticeable, even in the earliest stages.
Some changes improve after delivery, while others can take more time. The most important thing to remember is that many pregnancy symptoms are a normal part of the process. A trusted OB provider can help you understand what to expect and what deserves a closer look.
Knowing what is normal in each trimester can help you feel more prepared and reassured throughout pregnancy. While every pregnancy is different, understanding the patterns you are likely to experience can help you know when to rest, when to make small lifestyle adjustments, and when to reach out to your provider for support.
First Trimester (Weeks 1–13): Fatigue and Early Changes
Even before you show, your body is working hard to support early development. An immediate surge in hormones triggers major shifts. Rising progesterone levels often cause deep fatigue. Your breasts may feel tender, heavy, or sensitive as the surge of hormones stimulates the growth of milk ducts and glands in preparation for breastfeeding. Many women experience morning sickness (nausea or vomiting), constipation, bloating, mild uterine cramping, food aversions, and an intensified sense of smell. Early body aches, like mild headaches or lower back soreness, are also common as your body begins its rapid adaptation.
Second Trimester (Weeks 14–27): Growth and Energy
Often considered the most comfortable phase, the second trimester usually brings a welcome return of energy as early morning sickness fades. However, physical changes become much more visible – you may notice your clothes fit differently as your uterus expands. With this growth, your center of gravity also shifts, causing posture adjustments that can strain your lower back, hips, and pelvis.
You may feel round ligament pain—a sharp pulling or dull ache in the lower abdomen caused by stretching supporting tissues. Skin changes are also typical, including flushing, stretch marks, a dark abdominal line (linea nigra), or gray-brown facial patches (melasma). Best of all, the second trimester is usually when you will start to feel your baby’s first flutters and kicks, typically between weeks 16 and 24.
Third Trimester (Weeks 28–40+): Maximum Pressure
As your baby grows rapidly, physical pressure increases, often leading to more discomfort. Fluid retention can lead to swelling in your feet, ankles, and hands, sometimes causing temporary numbness like carpal tunnel syndrome. The heavy uterus presses against your internal organs, causing frequent urination, heartburn, and shortness of breath.
Sleep becomes more challenging during this phase, and structural body aches in the back and ribs intensify. Your skin will continue to stretch, which can cause mild itching. You may also experience Braxton Hicks “practice” contractions and increased pelvic pressure as the baby drops into position for birth.
When to Call Your OB
Many body changes during pregnancy are expected. If you are experiencing a minor discomfort, you can refer to this list of pregnancy-safe medications and treatments that are approved by the obstetricians at Virginia Physicians for Women. VPFW patients can also call their medical advice line at 804-897-2100 (press 2) with any questions during pregnancy.
However, some symptoms should always be checked by a provider. Contact your OB if you experience any of the following:
- severe pain
- heavy bleeding
- sudden swelling
- severe headaches
- vision changes
- chest pain
- decreased fetal movement
- or intense itching that gets worse at night.
It is always better to ask when something feels off. Pregnancy comes with many normal changes, but you do not have to sort through them alone. Having an experienced, supportive OB team can help you feel informed and cared for through every trimester.
For deeply detailed breakdowns, medical advice on safe prenatal fitness, and answers to common pregnancy questions, read the complete Body Changes During Pregnancy Article & FAQ.
