Weeks Pregnant Calculator

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Weeks Pregnant Calculator

Use this calculator to estimate your current gestational age, estimated due date (EDD), and trimester based on the first day of your last menstrual period (LMP) or a known estimated due date.

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function calculatePregnancy() { var lmpDateStr = document.getElementById('lmpDate').value; var eddDateStr = document.getElementById('eddDateInput').value; var resultDiv = document.getElementById('pregnancyResult'); resultDiv.innerHTML = "; // Clear previous results var today = new Date(); today.setHours(0, 0, 0, 0); // Normalize today's date to start of day var lmpDate, eddDate; var calculationMethod = "; if (lmpDateStr) { lmpDate = new Date(lmpDateStr); lmpDate.setHours(0, 0, 0, 0); // Normalize LMP date calculationMethod = 'LMP'; } else if (eddDateStr) { eddDate = new Date(eddDateStr); eddDate.setHours(0, 0, 0, 0); // Normalize EDD date // Derive LMP from EDD lmpDate = new Date(eddDate.getTime() – (280 * 24 * 60 * 60 * 1000)); calculationMethod = 'EDD'; } else { resultDiv.innerHTML = 'Please enter either your Last Menstrual Period (LMP) start date or your Estimated Due Date (EDD).'; return; } if (isNaN(lmpDate.getTime())) { resultDiv.innerHTML = 'Invalid date entered. Please use a valid date format.'; return; } // If LMP is in the future, it's an invalid input for current pregnancy calculation if (lmpDate.getTime() > today.getTime() && calculationMethod === 'LMP') { resultDiv.innerHTML = 'The LMP date cannot be in the future.'; return; } // Calculate gestational age var timeDiff = today.getTime() – lmpDate.getTime(); var daysPregnant = Math.floor(timeDiff / (1000 * 60 * 60 * 24)); if (daysPregnant = 0 && weeksPregnant = 14 && weeksPregnant = 28) { trimester = 'Third Trimester'; } else { trimester = 'Not yet pregnant (or date error)'; } var resultHTML = '

Your Pregnancy Details:

'; resultHTML += 'Current Gestational Age: ' + weeksPregnant + ' weeks and ' + remainingDays + ' days'; resultHTML += 'Estimated Due Date (EDD): ' + eddDate.toLocaleDateString('en-US', { year: 'numeric', month: 'long', day: 'numeric' }) + "; resultHTML += 'Current Trimester: ' + trimester + "; if (daysUntilEDD > 0) { resultHTML += 'Days Until EDD: ' + daysUntilEDD + ' days'; } else if (daysUntilEDD === 0) { resultHTML += 'Due Date is Today!'; } else { resultHTML += 'Due Date was: ' + Math.abs(daysUntilEDD) + ' days ago'; } resultDiv.innerHTML = resultHTML; } function clearResults() { document.getElementById('lmpDate').value = "; document.getElementById('eddDateInput').value = "; document.getElementById('pregnancyResult').innerHTML = "; } .calculator-container { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background-color: #f9f9f9; padding: 25px; border-radius: 10px; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1); max-width: 600px; margin: 30px auto; border: 1px solid #e0e0e0; } .calculator-container h2 { color: #333; text-align: center; margin-bottom: 20px; font-size: 28px; } .calculator-container p { color: #555; text-align: center; margin-bottom: 25px; line-height: 1.6; } .calculator-form .form-group { margin-bottom: 18px; } .calculator-form label { display: block; margin-bottom: 8px; color: #444; font-weight: bold; font-size: 16px; } .calculator-form .form-control { width: calc(100% – 22px); padding: 12px; border: 1px solid #ccc; border-radius: 6px; font-size: 16px; box-sizing: border-box; transition: border-color 0.3s ease; } .calculator-form .form-control:focus { border-color: #007bff; outline: none; box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25); } .calculate-button, .clear-button { display: inline-block; padding: 12px 25px; background-color: #007bff; color: white; border: none; border-radius: 6px; cursor: pointer; font-size: 17px; transition: background-color 0.3s ease, transform 0.2s ease; width: 48%; margin-top: 15px; } .calculate-button:hover { background-color: #0056b3; transform: translateY(-1px); } .clear-button { background-color: #6c757d; margin-left: 4%; } .clear-button:hover { background-color: #5a6268; transform: translateY(-1px); } .calculator-result { margin-top: 30px; padding: 20px; background-color: #e9f7ef; border: 1px solid #d4edda; border-radius: 8px; color: #155724; font-size: 17px; line-height: 1.8; } .calculator-result h3 { color: #0f5132; margin-top: 0; margin-bottom: 15px; font-size: 22px; text-align: center; } .calculator-result p { margin-bottom: 10px; text-align: left; color: #155724; } .calculator-result p strong { color: #0f5132; } .error-message { color: #dc3545; background-color: #f8d7da; border: 1px solid #f5c6cb; padding: 10px; border-radius: 5px; text-align: center; margin-top: 15px; }

Understanding Your Pregnancy Weeks

Knowing your current week of pregnancy is a fundamental part of the prenatal journey. It helps healthcare providers monitor your baby's development, schedule important tests, and prepare you for what to expect at each stage. This "Weeks Pregnant Calculator" provides an estimate of your gestational age, estimated due date (EDD), and current trimester.

How Pregnancy is Dated

Pregnancy is typically dated from the first day of your Last Menstrual Period (LMP), even though conception usually occurs about two weeks later. This method is used because the LMP is often the most reliable and easily identifiable date. A full-term pregnancy is considered to be 40 weeks (280 days) from the LMP.

  • Last Menstrual Period (LMP): This is the most common method. The calculator uses your LMP date to count forward 40 weeks to determine your EDD and then calculates your current gestational age based on today's date.
  • Estimated Due Date (EDD): If you've already had an ultrasound or a doctor has given you an EDD, you can use that date. The calculator will work backward 40 weeks to estimate your LMP and then calculate your current gestational age.
  • Ultrasound: Early ultrasounds (especially between 8-12 weeks) are often considered the most accurate way to date a pregnancy, as they measure the baby's size to estimate gestational age. If your EDD was determined by an ultrasound, use that date in the calculator.

Why is Gestational Age Important?

Your gestational age is crucial for several reasons:

  • Monitoring Fetal Development: Each week of pregnancy brings new developmental milestones for your baby. Knowing your gestational age helps you understand what changes are happening inside you.
  • Scheduling Prenatal Care: Specific screenings, tests, and appointments are scheduled based on your week of pregnancy to ensure optimal health for both you and your baby.
  • Planning and Preparation: It helps you anticipate upcoming changes in your body, prepare for childbirth, and plan for your baby's arrival.

Understanding Trimesters

Pregnancy is divided into three trimesters, each with its own unique characteristics and developmental stages:

  • First Trimester (Weeks 1-13): This period begins with conception and is marked by rapid fetal development, including the formation of major organs. Many women experience morning sickness and fatigue during this time.
  • Second Trimester (Weeks 14-27): Often considered the "golden trimester," many women feel more energetic, and symptoms like morning sickness may subside. The baby grows significantly, and you might start to feel fetal movements.
  • Third Trimester (Weeks 28-40+): The final stretch! Your baby continues to grow and mature, preparing for birth. You may experience increased discomfort, Braxton Hicks contractions, and prepare for labor and delivery.

Important Note:

This calculator provides an estimate for informational purposes only. It is not a substitute for professional medical advice. Always consult with your healthcare provider for accurate dating, medical guidance, and personalized care throughout your pregnancy.

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