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Your Ultimate Due Date Calculator Guide: How to Track Your Pregnancy Week by Week

Dr. Kirsten Foullong
December 21, 2024
Pregnant woman smiling during a chiropractic adjustment at Pinnacle Chiropractic.

Pregnancy is an incredible journey filled with excitement and change, but it also comes with its challenges. Tracking your due date and understanding what’s happening week by week helps you stay informed and prepared. In addition, taking care of your body during this transformative time is crucial—and pregnancy chiropractic care can be a game-changer for your comfort and wellness.

In this guide, we’ll explain how due date calculators work, explore your baby’s development week by week, and highlight the importance of chiropractic care during pregnancy to support both you and your growing baby.

How Does a Due Date Calculator Work?

A due date calculator is a simple tool that estimates your baby’s arrival by calculating 40 weeks (280 days) from the first day of your last menstrual period (LMP). Pregnancy typically lasts about 38 weeks from conception, and the calculator assumes a regular 28-day menstrual cycle.

Here are the three primary methods used to estimate your due date:

1. Last Menstrual Period (LMP) Method

This is the most common method because many women know the date their last period began.

  • How It Works: Add 280 days (40 weeks) to the first day of your last period.
  • Example: If your last period started on March 1, your due date would be December 6.

For women with irregular cycles, an ultrasound can provide more accuracy.

2. Conception Date Method

If you know the exact date you conceived (e.g., through ovulation tracking or fertility treatments), you can estimate your due date by adding 266 days (38 weeks).

  • Example: If you conceived on April 15, your due date would be January 9.

3. Ultrasound Method

Ultrasound scans are particularly helpful if you’re unsure of your LMP or have irregular cycles. During the first trimester, ultrasounds measure your baby’s crown-rump length to determine gestational age and adjust your due date if needed.

Why It’s Important to Know Your Due Date

Knowing your due date allows you and your healthcare provider to:

  • Monitor your baby’s growth and development
  • Plan important screenings and ultrasounds
  • Prepare for labor and delivery
  • Manage pregnancy milestones and symptoms

What to Expect Week by Week

Pregnancy is divided into three trimesters, each with its own milestones and changes. Tracking your progress week by week helps you understand what’s happening with your baby and your body.

First Trimester (Weeks 1–13)

  • Weeks 4–5: Your baby’s heart starts beating, and the placenta begins forming.
  • Week 6: Morning sickness, fatigue, and hormonal changes are common.
  • Week 10: Your baby is now a fetus, developing tiny fingers and toes.

Second Trimester (Weeks 14–27)

  • Week 16: You may feel the first flutters of movement, known as "quickening."
  • Week 20: Your baby can hear sounds, and an anatomy scan provides a detailed look at development.
  • Week 24: Your baby practices breathing movements, and you might notice rapid growth.

Third Trimester (Weeks 28–40)

  • Week 30: Your baby gains weight and settles into a head-down position.
  • Week 36: The baby’s lungs are developed, and they’re preparing for life outside the womb.
  • Week 40: While only 5% of babies arrive on their due date, most are born within two weeks before or after.

The Importance of Pregnancy Chiropractic Care

Tracking your due date and weekly progress is essential, but so is taking care of your body during pregnancy. As your baby grows, your body undergoes significant changes that can cause discomfort, pain, and stress. This is where pregnancy chiropractic care comes in.

At Pinnacle Chiropractic, our doctors are certified in the Webster Technique, a specialized chiropractic method for pregnant women that focuses on aligning the pelvis, reducing tension in surrounding muscles, and supporting the nervous system.

Benefits of Pregnancy Chiropractic Care

  1. Relieves Back and Pelvic Pain
    As your baby grows, the added weight can strain your back, hips, and pelvis, leading to discomfort or pain. Chiropractic adjustments help restore alignment and relieve pressure on these areas.
  2. Supports Proper Pelvic Alignment
    A misaligned pelvis can reduce the space available for your baby to move and grow, potentially leading to complications like breech positioning. Prenatal chiropractic care ensures your pelvis is properly aligned, promoting optimal fetal positioning.
  3. Eases Sciatica and Nerve Pain
    Many pregnant women experience sciatica due to the pressure of the baby on the sciatic nerve. Gentle adjustments alleviate this pressure, reducing pain and improving mobility.
  4. Improves Comfort and Mobility
    Chiropractic care helps your body adapt to the physical changes of pregnancy, reducing tension in your muscles and joints and improving overall comfort.
  5. Prepares Your Body for Labor and Delivery
    By maintaining proper alignment and reducing tension, chiropractic care can make labor and delivery smoother and more efficient. Many mothers report shorter labor times and fewer interventions after receiving regular chiropractic care during pregnancy.
  6. Supports the Nervous System
    The nervous system controls every function in your body, including hormone regulation and the changes that occur during pregnancy. Chiropractic adjustments keep your nervous system functioning optimally, benefiting both you and your baby.

When to Start Chiropractic Care During Pregnancy

You can begin chiropractic care at any point during pregnancy. Many women start early to address initial discomforts, while others seek care in the second or third trimester as their baby grows and physical changes intensify. Regular visits throughout your pregnancy provide consistent support for your changing body.

Why Choose Pinnacle Chiropractic for Prenatal Care?

At Pinnacle Chiropractic, we specialize in nervous system-based care tailored to the unique needs of pregnant women. Our Webster Technique-certified doctors provide safe, gentle, and effective adjustments designed to support your health and comfort throughout pregnancy.

Our goal is to help you feel your best as you prepare for one of life’s most exciting milestones.

Conclusion

Tracking your due date week by week gives you valuable insights into your baby’s development and helps you prepare for labor and delivery. Pairing this knowledge with pregnancy chiropractic care ensures that your body stays aligned, comfortable, and ready for the incredible journey ahead.

If you’re expecting and want to learn more about how chiropractic care can support your pregnancy, contact Pinnacle Chiropractic today. We’re here to help you enjoy a healthier, more comfortable pregnancy and set the stage for a smoother delivery.

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Pinnacle's office was open and welcoming—both the environment and the staff. The intake and evaluation process was simple and very well explained.
Our Pinnacle journey started over 3 years ago with our daughter and we've never been more at peace with our decision to get her evaluated at Pinnacle. We brought our 6 week old into the office for an array of struggles/issues after being told to "wait it out" by her doctor. Pinnacle's office was open and welcoming—both the environment and the staff. The intake and evaluation process was simple and very well explained. Pinnacle was able to pinpoint exactly what our daughter needed and develop a care plan to help her reach the wellness goals we set for her as a team. Once she achieved those goals, they continued to give us professional recommendations paired with regular adjustments to support her throughout her growth and development. Now, our entire family is adjusted consistently, including our newest addition since birth. It was the best decision we've ever made for both of our children, and now ourselves.
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My 10 month old has been delayed on her gross motor skills. At her 6 month checkup, her pediatrician recommended she get evaluated for PT. In her case, I felt like she needed more that just PT to get caught up. I’ve heard so many people speak highly of chiropractic care for kids, I thought we’d give it a try. I can’t remember how I came across Pinnacle (might have been on Instagram because they have a lot of helpful posts). But anyway, I called and setup the first couple appointments for intake and scans. The entire staff is super friendly. Dr. Matt listened very well to what was going on with my daughter and we came up with 3 goals for her to hopefully meet with 9 weeks of adjustments (2x/week). The afternoon after her 2nd adjustment, she literally reached 2 of her goals. I almost couldn’t believe it. I realize it could have just been a coincidence but it’s just too close to happening right after the adjustments for me to assume that. She’s had about 10 adjustments total now, and she is catching up on other gross motor skills. Because she is a baby, her adjustments are quite gentle. There’s no cracking or popping involved. I’ve now become a patient of theirs too, and I hope to start my other two children there as well!
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