Pregnancy Due Date Calculator
Your Pregnancy Timeline
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Understanding Pregnancy Due Dates
Learn how pregnancy due dates are calculated and what to expect during each trimester.
Use Due Date CalculatorHow Does a Due Date Calculator Work?
Your estimated due date (EDD) is calculated based on:
- Last Menstrual Period (LMP): The first day of your last period.
- Conception Date: If known, this can refine the calculation.
- Ultrasound Dating: Early ultrasounds provide the most accurate due date.
The most common method (Naegele's Rule) adds 280 days (40 weeks) to the first day of your last period.
Pregnancy Timeline & Key Milestones
First Trimester (Weeks 1-12)
- Major fetal development begins (heart, brain, limbs).
- Early pregnancy symptoms (nausea, fatigue).
- First prenatal visit typically occurs during this time.
Second Trimester (Weeks 13-26)
- Baby's movements felt (quickening).
- Gender may be detectable via ultrasound.
- Most comfortable period for many women.
Third Trimester (Weeks 27-40+)
- Rapid growth & final organ development.
- Preparation for labor & delivery.
- More frequent prenatal visits.
Frequently Asked Questions
Due dates are estimates. Ultrasounds in the first trimester provide the most precise dating, typically within 3-5 days of accuracy.
Yes, healthcare providers may adjust your due date if early ultrasound measurements differ significantly from LMP-based calculations, especially if your cycles are irregular.
An early ultrasound can help determine gestational age. The first trimester ultrasound (especially between 8-12 weeks) provides the most accurate dating.
- IVF pregnancies: Use embryo transfer dates plus 266 days (or 38 weeks).
- Irregular cycles: May require ultrasound confirmation.
- Fundal height measurements: Later in pregnancy, though less accurate.
Tips for a Healthy Pregnancy
Focus on folate-rich foods, iron, calcium, and protein. Stay hydrated and consider prenatal vitamins as recommended by your healthcare provider.
Engage in safe activities like walking, swimming, or prenatal yoga. Aim for 30 minutes of moderate exercise most days, with your provider's approval.
Attend all scheduled prenatal visits. Discuss any concerns with your provider and follow recommended screening schedules.
