Pregnancy Calculator
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What is a Pregnancy Calculator?
A pregnancy calculator helps you estimate your due date and track your pregnancy progress based on the first day of your last menstrual period (LMP). It calculates important milestones including your estimated due date, current week of pregnancy, trimester, and days remaining until delivery.
This calculator uses the standard Naegele's rule, which adds 280 days (40 weeks) to the first day of your last menstrual period to estimate your due date. This is the most common method used by healthcare providers.
Understanding Pregnancy Timeline
First Trimester (Weeks 1-13)
Early development, morning sickness, and fatigue are common. This is when major organs begin to form.
Second Trimester (Weeks 14-27)
Often called the "golden period" - energy returns, morning sickness typically subsides, and you may feel the baby move.
Third Trimester (Weeks 28-40)
Final growth phase, baby gains weight rapidly, and you prepare for delivery. Discomfort may increase as you near your due date.
Important Notes
Disclaimer: This calculator provides estimates only and should not replace professional medical advice. Only about 5% of babies are born exactly on their due date - most are born within two weeks before or after.
Always consult with your healthcare provider for accurate pregnancy dating, especially if you have irregular periods or if an ultrasound shows a different due date.
Frequently Asked Questions
Why is the due date calculated from LMP?
The first day of your last menstrual period is used because it's easier to track than the exact date of conception. Pregnancy is typically counted from the first day of your last period, even though conception usually occurs about two weeks later.
What if I don't know my LMP date?
If you're unsure of your LMP date, your healthcare provider can estimate your due date using an ultrasound, especially in the first trimester when measurements are most accurate.
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