You've found out you're pregnant - fantastic news! You must be wondering when your baby will arrive? It can tricky calculating this - should you start from the first day of your last period? Last day of your first period? Alas, it's the most important day in your pregnancy, you need it to be bang on! But don't worry, we got you :)

Here’s a simple guide to understanding how to figure out your pregnancy due date.

1. Start with Your Last Menstrual Period (LMP)

The most commonly used method to calculate your due date is based on the first day of your last menstrual period (LMP). Here’s how:

1. Step 1: Record the first day of your last period.

2. Step 2: Add 280 days (or 40 weeks) to that date.

For example, if your LMP was March 1, 2024, your estimated due date would be December 6, 2024. This calculation works best for people with a regular 28-day cycle. If your cycle length differs, this might need adjustment.

2. Use Your Ovulation or Conception Date

If you track ovulation or know the date of conception, this method offers more accuracy. Pregnancy typically lasts about 266 days (38 weeks) from ovulation or conception. Add that to your known ovulation date to find your due date.

For instance: If conception occurred on March 10, 2024, your estimated due date would be December 1, 2024.

3. Confirm with an Ultrasound

An early ultrasound, especially in the first trimester, is one of the most accurate ways to determine your due date. During the scan, your baby’s size is measured to estimate gestational age. If the date differs significantly from the one calculated using your LMP, your provider may adjust your due date accordingly.

4. Try a Reliable Due Date Calculator

Online tools make it easy to calculate your due date in seconds. Simply input the date of your LMP or conception, and you’ll get an estimated date. While helpful, these tools should complement—not replace—advice from your healthcare provider.

5. Stay Flexible—It’s Just an Estimate

Remember, your due date is only a guideline. Most babies aren’t born on their exact due date—about 5% of babies arrive precisely on schedule, while the majority are born within a week before or after. The important thing is focusing on your health and well-being throughout your pregnancy.

Final Thoughts

Your pregnancy journey is uniquely yours, and understanding your due date is just the start of preparing to meet your baby. As you navigate these exciting months, having access to trusted resources and support is invaluable.

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