PregnancyTracker
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PregnancyTracker

Track your pregnancy week by week, calculate due dates, ovulation, and more. Evidence-based tools and resources for every stage of your journey.

Calculators

  • Due Date Calculator
  • Pregnancy Week Calculator
  • Ovulation Calculator
  • Conception Calculator

Resources

  • Week by Week
  • First Trimester
  • Pregnancy Symptoms
  • Nutrition Guide

Medical Disclaimer

This website provides general information and is not a substitute for professional medical advice. Always consult your healthcare provider for medical decisions.

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    First Trimester

    Week 4

    Implantation and Early Development

    ProgressWeek 4 of 40
    Size
    Poppy seed
    Length
    0.04 in
    Weight
    <0.04 oz

    Baby's Development

    Your baby is now a blastocyst implanting in the uterine lining. The neural tube, which will become the brain and spinal cord, begins to form. The placenta starts developing to provide oxygen and nutrients.

    Wellness Tips

    • Start taking prenatal vitamins with folic acid
    • Schedule your first prenatal appointment
    • Avoid alcohol, smoking, and certain medications

    Common Symptoms

    Light spotting (implantation bleeding)
    Mild cramping
    Breast tenderness
    Fatigue

    Medical Disclaimer

    Every pregnancy is unique. The information provided is for educational purposes and should not replace professional medical advice. Always consult your healthcare provider with any concerns.