Daisycle Pregnancy Due Date Calculator — Estimate Your Baby’s Arrival with Confidence

Pregnancy is a remarkable journey, filled with anticipation and milestones. One of the first questions expectant parents ask is, “When is my baby due?”
The Daisycle Pregnancy Due Date Calculator helps estimate your expected delivery date (EDD) using trusted medical methods — giving you a helpful timeline for each stage of pregnancy.

Note: The due date is an estimate, not an exact prediction. Only about 5% of babies arrive on their calculated due date — most are born between 37 and 42 weeks.

🍼 How Is the Due Date Calculated?

The estimated due date (EDD) can be determined in several ways.
Daisycle uses standard medical formulas that align with methods used by healthcare providers.

1️⃣ Last Menstrual Period (LMP) Method

This is the most common and widely used method.

• Pregnancy is counted from the first day of your last menstrual period (even though conception typically occurs ~2 weeks later).

• Formula: LMP + 280 days (or 40 weeks).

Example:
If your LMP was January 1, your estimated due date would be October 8.

Works best if you have regular cycles and know your period start date.

2️⃣ Conception Date Method

If you know your exact date of conception or ovulation, this method may be more precise — especially for those with irregular cycles or using fertility treatments.

• Formula: Conception Date + 266 days (38 weeks).

• Adjust for your specific cycle length if shorter or longer than 28 days.

3️⃣ Ultrasound Dating Method

Healthcare providers often confirm or adjust the due date based on an early ultrasound (6–12 weeks).

• The sonographer measures crown–rump length (CRL) — the embryo’s size — to estimate gestational age.

• Ultrasound-based EDD is more accurate when:

  • Your LMP is uncertain

  • Your cycles are irregular

  • You conceived soon after stopping birth control

Later ultrasounds are less precise for dating since babies grow at different rates.

4️⃣ IVF (In Vitro Fertilization) Method

If you conceived through IVF, the due date is calculated based on the embryo transfer date, not your LMP.

• Formula (standard clinical use):

  • Day-3 embryo: Transfer date + 266 days

  • Day-5 embryo (blastocyst): Transfer date + 263 days

IVF clinics often provide an official EDD, but Daisycle’s calculator can confirm and track milestones.

🎯 How Accurate Is a Due Date Calculator?

Due date calculators give an estimated delivery timeframe.
On average:

• Only ~1 in 20 babies are born exactly on the predicted date.

• Most births occur within two weeks before or after the EDD.

Factors That Affect Accuracy

• Cycle length & ovulation timing: Irregular ovulation shifts conception day.

• Multiple pregnancies: Twins/triplets often arrive earlier.

• First-time pregnancies: May last slightly longer.

• Health factors: Hormonal conditions, stress, or medical interventions can influence timing.

An early first-trimester ultrasound remains the gold standard for the most accurate due date confirmation.

🧮 How to Use the Daisycle Due Date Calculator

1. Open the Pregnancy Calculator in the Daisycle app.

2. Enter either:

   • First day of your last period (LMP), or

   • Conception/ovulation date.

3. (Optional) Add your average cycle length if it differs from 28 days.

4. Tap “Calculate” — Daisycle instantly displays:

   • Estimated due date (EDD)

   • Current gestational week

   • Trimester milestones

   • Baby’s approximate size and development stage

📅 Pregnancy Timeline Overview

Full-term pregnancy is considered 37–42 weeks. Deliveries before 37 weeks are preterm, and after 42 weeks are post-term.

🤰 What If the Baby Arrives Early or Late?

• Preterm birth: Before 37 weeks — may need neonatal care.

• Post-term pregnancy: Beyond 42 weeks — doctors may discuss induction to reduce risks.

• Early-term: 37–38 weeks; Full-term: 39–40 weeks; Late-term: 41 weeks.

Your provider will monitor your baby’s growth and health to guide next steps.

🩺 When to Contact Your Healthcare Provider

• Uncertain LMP or irregular cycles

• No fetal movement after 24 weeks

• Pain, bleeding, or fluid leakage at any stage

• Concerns about preterm labor or reduced fetal movement

Bottom Line

The Daisycle Pregnancy Due Date Calculator is a reassuring companion for tracking your pregnancy timeline — from conception to delivery.
It helps you understand how far along you are, what’s happening week by week, and when to expect your baby’s arrival — all while keeping your health data private, secure, and in your control.