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Pregnancy Calculator

weeks
days

Your Pregnancy Timeline

Due Date
Conception Date
Current Progress

First Trimester
Weeks 1-13
Second Trimester
Weeks 14-26
Third Trimester
Weeks 27-40

Important Milestones & Appointments

Week Date Milestone/Appointment

Pregnancy Dating Methods

This calculator offers three methods to estimate your due date:

  • Last Menstrual Period (LMP): The most common method, counts from the first day of your last period.
  • Conception Date: Counts from the estimated date of conception (usually 14 days after LMP).
  • Ultrasound Dating: Uses measurements from an ultrasound to determine gestational age.

Understanding Pregnancy Calculation

Pregnancy dating is a fascinating blend of tradition and modern medicine. Pregnancies are typically calculated as 40 weeks (280 days) from the first day of the last menstrual period (LMP), not from the actual day of conception. This means that by the time you know you're pregnant, you're already considered to be about 4 weeks along, even though the embryo is only about 2 weeks old.

Pregnancy Trimesters:

  • First Trimester (Weeks 1-13): This is the period of most rapid development. By the end of this trimester, all major organs are formed, and the fetus begins to move.
  • Second Trimester (Weeks 14-26): Often called the "golden period" as many discomforts of early pregnancy fade. The baby grows significantly, and you'll likely feel movements.
  • Third Trimester (Weeks 27-40): The baby gains weight and prepares for birth. You may experience more discomfort as your body prepares for delivery.

Common Prenatal Appointments and Tests:

  • First Prenatal Visit (Weeks 8-10): Comprehensive exam, medical history, and possibly an ultrasound.
  • NIPT - Non-Invasive Prenatal Testing (Weeks 10-13): Blood test that screens for certain genetic conditions.
  • Anatomy Scan (Weeks 18-22): Detailed ultrasound examining baby's organs and structures.
  • Glucose Screening (Weeks 24-28): Tests for gestational diabetes.
  • Group B Strep Test (Weeks 36-37): Screens for bacteria that can affect newborns.
  • Weekly Check-ups (Weeks 36-40): More frequent visits to monitor the end of pregnancy.

Important Note

This calculator provides estimates based on standard pregnancy timeframes. Every pregnancy is unique, and your healthcare provider may adjust your due date based on ultrasound measurements or other factors. Only about 4% of babies are born exactly on their due date—most arrive within two weeks before or after. Always follow your healthcare provider's guidance for your specific situation.

Related Calculators

Due Date Calculator

Calculate your estimated due date based on last menstrual period or conception date.

Age Calculator

Calculate your exact age in years, months, days, hours, and minutes.

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Navigating Your Pregnancy Journey

Pregnancy is a transformative experience not just physically, but emotionally and socially as well. As your body nurtures new life, you may experience a range of emotions—from joy and excitement to anxiety and uncertainty. These feelings are entirely normal and shared by many expectant parents. Creating a support network of healthcare providers, family, friends, and possibly other expectant parents can provide reassurance and practical assistance throughout your journey. Many communities offer prenatal classes, support groups, and resources specifically designed for this significant life transition.

Self-care becomes especially important during pregnancy. Gentle physical activity like walking, swimming, or prenatal yoga (with healthcare provider approval) can help manage discomfort, prepare your body for birth, and boost your mood through the release of endorphins. Nutrition also plays a vital role—focus on a balanced diet rich in fruits, vegetables, whole grains, lean proteins, and healthy fats. Proper hydration, adequate rest, and stress management techniques such as meditation or deep breathing can further support your well-being. While it's natural to have questions about what's normal, always reach out to your healthcare provider with concerns rather than relying solely on internet searches.

Preparation for birth and beyond is another aspect of the pregnancy journey. As your due date approaches, consider creating a birth plan that outlines your preferences while remaining flexible for unexpected situations. Learning about labor, delivery, and postpartum recovery can help you feel more prepared and confident. If you plan to breastfeed, consider connecting with lactation resources before birth. Finally, organizing practical matters like arranging for help after birth, preparing your home, and gathering essential baby items can ease the transition to parenthood. Remember that while planning is beneficial, being adaptable is equally important as each pregnancy and birth experience is unique.