1. What Is Pregnancy Duration Calculation?

Pregnancy duration calculation determines how long you have been pregnant based on your last menstrual period (LMP) date. This is the standard method used by healthcare providers to estimate gestational age.

2. How Does The Calculator Work?

The calculator uses the standard pregnancy dating formula:

Where:

• \( Current\ Date \) — Today's date or any specified date
• \( LMP\ Date \) — First day of your last menstrual period

Explanation: Pregnancy is traditionally calculated from the first day of your last menstrual period, adding approximately 2 weeks before conception actually occurs.

3. Importance Of Pregnancy Dating

Details: Accurate pregnancy dating is crucial for monitoring fetal development, scheduling prenatal tests, determining due date, and making important healthcare decisions throughout pregnancy.

4. Using The Calculator

Tips: Enter the first day of your last menstrual period and the current date (or any date you want to check). The calculator will display your pregnancy duration in weeks and days.

5. Frequently Asked Questions (FAQ)

Q1: Why is pregnancy calculated from LMP instead of conception?
A: LMP is used because most women can accurately recall their last period date, while conception date is often unknown.

Q2: How accurate is LMP dating?
A: LMP dating is generally accurate within ±5 days if periods are regular. Ultrasound dating may be more precise.

Q3: What if I don't know my exact LMP date?
A: Provide your best estimate. An early pregnancy ultrasound can provide more accurate dating if LMP is uncertain.

Q4: Does this work for IVF pregnancies?
A: For IVF pregnancies, use the embryo transfer date plus 14 days for more accurate dating.

Q5: When should I see a healthcare provider?
A: Schedule your first prenatal appointment as soon as you suspect pregnancy, typically around 8 weeks gestation.