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PregnancyParentingBlog

Week 1: The Beginning of the Journey

The first week of pregnancy is the time of conception. Your baby does not exist yet, but your body is preparing for this event.

Baby size: Not yet existent

Week 1Week 40

Baby development

What’s happening with the future baby?

At this stage the "baby" is still a wonderful idea and biological potential. Development occurs at the cellular level, and here’s how:

  • Follicle race: In your ovaries tens of thousands of microscopic sacs (follicles) contain immature eggs. This week, under hormonal influence, several of them begin to grow.
  • Champion selection: Over the next 7–10 days only one follicle will become dominant. It will continue to grow until it finally releases a mature egg. This process is called ovulation.
  • Genetic code: Each egg already carries a unique genetic treasure — 23 chromosomes. That’s exactly half of what your child will become.

So, although there has been no physical contact with a sperm yet, half of the future life is already preparing for its fateful meeting. To better understand this magical process, check out our article on how ovulation works.

Changes for mom

Your Body: A Week of Renewal

The main sensations this week are linked to menstruation, as your hormones — estrogen and progesterone — are at their lowest levels. This signals the uterus to cleanse itself and start anew.

What you may experience:

  • Lower‑abdominal cramps (uterine contractions).
  • Increased fatigue.
  • Sensitivity or pain in the breasts.
  • Emotional swings — from sadness to irritability.
  • Bloating.
Important to remember: this is completely normal. Your body isn’t "suffering," it’s diligently working, preparing for possible conception. Be kind to yourself.

This is a great opportunity to start better understanding your body’s signals. Keeping a calendar will help you notice patterns and prepare for the next phases. Learn more about the basics of the menstrual cycle to become an expert in your own body.

Overview

Week 1: On the Verge of a Miracle

Welcome to the official start of your great journey! It may seem strange, but the first week of pregnancy is the week of your last menstrual period. You are not yet pregnant in the classic sense, but from this day doctors begin counting the 40 weeks.

Your body begins a new cycle, shedding the uterine lining (endometrium) and, most importantly, starts preparing a single egg for possible fertilization.

This is a time for "renewal" and setting the stage. The main event of this week happens behind the scenes — in your ovaries, where hormones kick off new life.

Think of this period as laying the foundation. The stronger it is, the healthier the entire "building" will be. It's time to review your habits and learn more about key steps in pregnancy planning.

Tips for mom

How to Prepare Yourself: Practical Steps

This is your “zero” week, perfect for establishing healthy habits that will be useful throughout the entire pregnancy.

Your focus this week:

  1. Folic acid — your best friend. Start taking 400–600 µg of folic acid daily. This is critically important for preventing neural‑tube defects in the developing fetus. The topic is so important that we dedicated a separate article to it: “Why folic acid is so important?”.
  2. Kitchen and medicine cabinet review. Fill your diet with whole foods, vegetables, and protein. Discuss any medications you take regularly with your doctor.
  3. Movement is life. Light activity such as walking, yoga, or swimming improves mood, circulation, and prepares the body for upcoming changes.
  4. Say “no” to harmful habits. Alcohol, nicotine and other toxins can damage the egg even during its maturation.

Tips for partner

Partner’s Role: Player #2 on the Team

Your involvement matters from day one! It’s not just “her” project, it’s your shared adventure. Your support now is an investment in the peace and health of your family.

  • Be present. Menstruation can be physically and emotionally draining. Offer help, make tea, take on some household chores. It’s simple but priceless.
  • Become a health team. Quitting smoking or cutting back on alcohol is much easier together. Treat it as a joint challenge.
  • Talk about everything. Discuss your expectations, fears, financial matters. Openness now will help avoid stress later. Our article on communication in a couple can give you useful tips.
  • Plan together. Suggest going to the pharmacy together for prenatal vitamins or cooking a healthy dinner together. It shows your involvement.

Checklist

Your Tasks for the Week: Clear and Itemized

To avoid getting lost in information, here’s a simple action plan. Check off completed items and feel in control.

  1. ✅ Record the date: Write down the first day of your period. This is the "birthday" of your pregnancy.
  2. 💊 Buy vitamins: Purchase and start daily prenatal vitamins with folic acid.
  3. 🗓️ Schedule a doctor’s visit: If you haven’t done so already, now is the time for a pre‑conception consultation.
  4. 🥗 Analyze lifestyle: Create a realistic plan for nutrition and quitting harmful habits.
  5. 🗣️ Hold a “family meeting”: Openly discuss plans with your partner.
  6. 🚶‍♀️ Add activity: Incorporate 30 minutes of light physical activity into your daily schedule.
  7. 📝 Start a calendar: Download an app or use a notebook for tracking your cycle.
Week 2 →