Eager to Find Out Your Estimated Due Date?
Use our Ornavo calculator to know when your little one might arrive! 💕
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Ornavo's Due Date Pregnancy Calculator Week by Week
Are you confused about your delivery date? Or do you find the pregnancy calculator confusing? Don’t worry — try Ornavo’s Period And Ovulation Tracker, a simple and accurate tool that helps you calculate your baby’s arrival date. Whether you’re tracking by your last menstrual period (LMP), conception date, or IVF transfer, our pregnancy counter gives you a personalized estimated due date in seconds.
How does the Ornavo Pregnancy Due Date Calculator work?
Our pregnancy month calculator by week estimates your due date by counting 280 days (40 weeks) from the first day of your last menstrual period (LMP). Ovulation—and therefore conception—typically occurs about 14 days after the start of your cycle. Even if you’re not sure of your exact conception date, this calculation provides a medically accepted estimate.
Why Knowing Your Due Date Matters
- Track Your Baby’s Growth: Your provider will measure fetal development at specific gestational ages.
- Plan Your Appointments: Many tests are time-sensitive during pregnancy.
- Make Informed Choices: Knowing your trimesters helps guide lifestyle and health decisions.
The Ornavo Estimated Due Date pregnancy calculator online offers an accurate starting point for expecting parents and healthcare professionals.
Ultrasound Dating: A Clinical Alternative
While the LMP method is common, ultrasound scans can provide a more accurate gestational age, especially in the first trimester. Between weeks 7–10, a transvaginal ultrasound can measure the embryo’s crown-rump length (CRL).
Ultrasound may be preferred if:
- You have irregular menstrual cycles
- You’re unsure of your LMP
- You conceived shortly after stopping birth control
Conception Date Calculator: A Direct Approach
If you know exactly when you conceived, simply add 266 days to the date of fertilization. This is especially useful if you track ovulation or use fertility apps.
IVF Due Date Calculator: Tailored for Assisted Conception
If you became pregnant through IVF, your due date can be more precise. We account for:
- Date of embryo transfer
- Type of embryo (Day 3 or Day 5)
- Egg retrieval & fertilization timing
Factors That Can Influence Your Due Date
- Irregular Periods: Makes LMP-based methods less reliable. Early ultrasound is best.
- Late or Early Ovulation: Shifts your conception window.
- Ultrasound Adjustments: Providers may revise your due date after measurement.
- Multiple Pregnancies: Twins or more may arrive earlier and require special planning.
What If You Don’t Know Your LMP?
No worries. You can still get accurate results:
- Use ultrasound dating
- Estimate via ovulation symptoms
- Doctor-based medical history review
Understanding the Results
Only 4% of babies are born exactly on their due date. Most pregnancies reach full term between 37 and 42 weeks. Think of your due date as a helpful guide — not a fixed deadline.
Trimester Breakdown
- First Trimester (Weeks 1–12): Early development, nausea, hormone shifts
- Second Trimester (Weeks 13–27): Baby bump shows, anatomy scan, increased energy
- Third Trimester (Weeks 28–40): Final growth, birth plan, delivery prep
Why Use the Ornavo Estimated Due Date Calculator?
- Trusted, accurate formulas
- Supports LMP, Conception, IVF & Ovulation methods
- Great for irregular cycles
- Mobile-optimized, fast results
- Perfect for prenatal planning
Final Thoughts
Whether you're tracking from your last period, using fertility tools, or navigating IVF — the Ornavo Due Date Calculator is your go-to tool for a fast and reliable estimate. 💕
