Week 10 of Pregnancy: The End of the First Trimester and Initial Tests

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Motherhood

In week 10, you are already in the final stretch of the first trimester, and your baby has reached an important milestone: they stop being an embryo and officially become a fetus. Their vital organs are already formed and begin to mature, their heart beats strongly, and their facial features are becoming more defined.

Each week is one step closer to meeting your baby. Keep taking care of yourself and enjoying this beautiful journey!

Causes and Risk Factors

Symptoms

  • Nausea and vomiting
    They may still be present, although for many women they begin to decrease over the next few weeks.
  • Extreme fatigue
    The increase in progesterone production continues to cause feelings of tiredness and sleepiness.
  • Skin and hair changes
    Increased blood flow and hormones can make your skin look more radiant (“pregnancy glow”), but spots or acne may also appear.
  • Increased vaginal discharge
    It is normal to have more clear or white vaginal discharge (leukorrhea), which helps prevent infections.
  • Breast changes
    Your breasts may feel heavier, more sensitive, and have darker areolas as they prepare for breastfeeding.
  • Greater emotional sensitivity
    Hormones can make you feel more sensitive, irritable, or have sudden mood swings.
  • Gas and bloating
    Your digestion slows down, which can cause a feeling of heaviness, gas, and constipation.
  • Increased urinary frequency
    The uterus continues to grow and put pressure on the bladder, making you go to the bathroom more often.

Embryo size

This week, your baby stops being an embryo and becomes a fetus, marking a milestone in their development. Their growth is rapid, and their main organs are already formed, although they will continue to mature over the coming weeks.

  • Vital organs functioning
    The heart beats strongly (around 180 beats per minute) and already pumps blood throughout their tiny body. Their kidneys, intestines, liver, and brain continue developing and beginning to function.
  • More defined face
    The eyes, which were previously on the sides of the head, begin to move toward the front. The ears continue to take shape, and the nose is now more visible.
  • More developed limbs
    Their arms and legs are already formed and moving. The fingers and toes have lost the webbing that connected them and are now separated.
  • Nervous system in action
    Neural connections advance rapidly, and your baby can already make reflex movements, such as bending the elbows and moving the hands.
  • First signs of nails and hair
    A fine layer of hair called lanugo begins to develop, which will protect their skin. The first signs of nails also appear on the fingers.?

What should you do?

  • Attend your prenatal checkup
    If you have not done so yet, schedule your first ultrasound to assess the baby’s development and hear their heartbeat.
  • Take prenatal vitamins
    Folic acid, iron, calcium, and other nutrients remain essential to prevent birth defects and support the baby’s development.
  • Maintain a healthy diet
    Eat foods rich in protein, fiber, and essential fatty acids. Avoid ultra-processed foods, excess sugar, and caffeine.
  • Stay well hydrated
    Drink enough water to prevent constipation and maintain good blood circulation.

Nutrition in week 10 of pregnancy

Folic acid (Vitamin B9)
Prevents neural tube defects.
Sources: Spinach, broccoli, lentils, orange, avocado.
Iron
Helps prevent anemia and supports red blood cell formation.
Sources: Lean meats, spinach, lentils, chickpeas, eggs.
Calcium
Contributes to the formation of the baby’s bones and teeth.
Sources: Milk, yogurt, cheese, almonds, broccoli, sardines.
Protein
Essential for the growth of the baby’s tissues.
Sources: Chicken, fish, eggs, legumes, tofu, nuts.
Omega-3
Supports the development of the baby’s brain and vision.
Sources: Salmon, chia, flaxseed, walnuts, olive oil.
Fiber
Helps prevent constipation.
Sources: Oats, whole-grain bread, fruits, vegetables, legumes.
Hydration
It is key for digestion and blood circulation.
Drink at least 2 liters of water per day.

Avoid:
Cold cuts and raw meats (risk of toxoplasmosis).
Excess caffeine and energy drinks.
Ultra-processed foods and foods high in sugar.
A good diet will help you feel better and help your baby grow healthy and strong. Take care of your diet and enjoy this stage!

Avoid:
High-impact exercises or those with a risk of falls.
Sudden movements or heavy weight loads.
Traditional crunches (it is better to choose adapted exercises).

Always consult your doctor before starting any routine. Listen to your body and enjoy movement safely. Your well-being and your baby’s are the most important!

Exercise in the first week of pregnancy

-Reduces nausea and fatigue.
-Improves circulation and helps prevent swelling.
-Strengthens key muscles for pregnancy and childbirth.
-Helps manage weight gain in a healthy way.
-Improves mood and reduces stress.
-Promotes better rest and sleep quality.

Recommended exercises:
Gentle walks (20–30 min a day) – Improves circulation and the cardiovascular system.
Prenatal yoga – Helps with flexibility, breathing, and relaxation.
Kegel exercises – Strengthen the pelvic floor for childbirth and postpartum recovery.
Swimming – Reduces pressure on the joints and strengthens muscles without impact.
Gentle stretching – Relieves back pain and improves posture.

Things You Should NOT Do:

Food and Drinks
Alcohol and excessive caffeine
Raw or undercooked meats (risk of toxoplasmosis and salmonella)
Unpasteurized dairy
Fish high in mercury (tuna, swordfish, shark)

Lifestyle and Habits
Smoking or being around cigarette smoke
Self-medicating without consulting your doctor
Exposure to toxic chemicals (paints, pesticides, strong cleaners)
Stress and lack of rest (try to sleep at least 7–9 hours)

Exercise and Movements
High-impact exercises or those with a risk of falls
Lifting heavy objects
Very hot baths or saunas (can affect blood pressure and the baby’s temperature)

Frequently Asked Questions

About the size of a strawberry (around 3–4 cm and 4–5 grams).

Yes, but they are still too small for you to feel their movements.

Yes, almost all the main organs are in place and are starting to function.

Yes, fatigue is common due to hormonal changes and increased blood production.

For many women, nausea improves between weeks 12 and 14.

Yes, unless your doctor indicates otherwise.

Hormones such as estrogen and progesterone affect your mood.

It depends on each woman, but some begin to notice changes in how their clothes fit starting this week.

Yes, but avoid high-impact exercise and consult your doctor about safe activities.

Raw meats, fish high in mercury, unpasteurized dairy, excessive caffeine, and uncooked cold cuts.

Generally between weeks 11 and 14, for the nuchal translucency ultrasound.

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