Baby Centre Pregnancy Calculator

How to Use This Calculator

Using our pregnancy calculator is simple:

1. Enter your last menstrual period (LMP) date or your estimated due date (EDD).
2. Click "Calculate" to see your pregnancy timeline.
3. Review the results to understand your current pregnancy week and what to expect.

The calculator will show you:

• Your current pregnancy week
• Estimated due date
• Pregnancy timeline with key milestones
• Baby development information for your current week

Understanding Your Pregnancy Timeline

A typical pregnancy lasts about 40 weeks (280 days) from the first day of your last menstrual period. However, each pregnancy is unique, and your due date may vary.

First Trimester (Weeks 1-12)

During the first trimester, your baby's major organs and body structures are developing. Key milestones include:

• Week 1-2: Implantation and early development
• Week 3-4: Heartbeat detectable, rapid growth
• Week 5-6: Limbs forming, facial features developing
• Week 7-8: Baby can make facial expressions
• Week 9-12: Baby can hear sounds, practice breathing

Second Trimester (Weeks 13-26)

The second trimester is often when many women feel more comfortable with their pregnancy. Key developments include:

• Week 13-14: Baby can taste, may suck thumb
• Week 15-16: Baby's bones are hardening
• Week 17-18: Baby's eyes can focus, eyelids are forming
• Week 19-20: Baby can hear outside sounds
• Week 21-26: Baby gains weight rapidly, practicing breathing movements

Third Trimester (Weeks 27-40)

The final months of pregnancy bring rapid growth and preparation for birth. Key developments include:

• Week 27-28: Baby's lungs continue to mature
• Week 29-30: Baby's head engages in the pelvis
• Week 31-32: Baby's brain continues to develop
• Week 33-34: Baby's movements become more pronounced
• Week 35-37: Baby is in a head-down position
• Week 38-40: Baby is considered full-term

How Due Dates Are Calculated

Your due date is typically calculated by adding 280 days (40 weeks) to the first day of your last menstrual period. However, there are several methods used to determine your due date:

Last Menstrual Period (LMP) Method

The most common method is to count 280 days from the first day of your last menstrual period. This is often referred to as your estimated due date (EDD).

Ultrasound Method

An ultrasound can provide a more precise due date by measuring the gestational sac and estimating the baby's age based on the number of weeks since conception.

Early Dating Scan

An early dating scan performed between 6-13 weeks can confirm your due date by measuring the gestational sac and fetal pole.

Common Pregnancy Concerns

Pregnancy comes with many questions and concerns. Here are some common ones addressed:

When Will I Know I'm Pregnant?

You may notice symptoms like missed periods, nausea, breast tenderness, and fatigue. A home pregnancy test can confirm your pregnancy about 10-14 days after ovulation.

What Should I Eat During Pregnancy?

A balanced diet rich in fruits, vegetables, lean proteins, whole grains, and healthy fats is recommended. Avoid raw or undercooked foods, certain fish, and excessive caffeine.

When Should I Start Prenatal Vitamins?

Ideally, you should start taking a prenatal vitamin before conception. If you didn't, start taking one as soon as you know you're pregnant.

How Often Should I See My Doctor?

Regular prenatal check-ups are essential. Typically, you'll see your doctor every 4 weeks in the first trimester, every 2-4 weeks in the second trimester, and weekly or as needed in the third trimester.