Pregnancy Calculator – Due Date & Week Calculator

Pregnancy Calculator

Last Menstrual Period (LMP) Conception Date Due Date
Current Date
Cycle Length days
Luteal Phase Length days

Due Date: Select calculation method Current Pregnancy Week– Days Until Due Date– Estimated Conception Date– First Trimester– Second Trimester– Third Trimester– Estimated Fetal Age– Next Prenatal Visit–

Pregnancy Milestones

Weekly Milestones Monthly Milestones

Week	Baby Development	Mother Changes
4	Neural tube forms	Missed period
8	Major organs develop	Morning sickness begins
12	Fingers and toes form	End of first trimester
16	Gender can be determined	Energy returns
20	Halfway point reached	Baby movements felt
24	Viability milestone	Glucose screening
28	Eyes can open	Third trimester begins
32	Rapid brain development	Braxton Hicks contractions
36	Lungs nearly mature	Baby considered full-term soon
40	Ready for birth	Due date arrives

Month	Key Developments	Prenatal Care
1	Implantation occurs	Confirm pregnancy
2	Heart begins beating	First prenatal visit
3	All organs present	Genetic screening
4	Movement begins	Anatomy scan
5	Rapid growth phase	Glucose tolerance test
6	Hearing develops	Regular checkups
7	Fat accumulation	Group B strep test
8	Brain development	Birth plan discussion
9	Full-term preparation	Weekly appointments

The Pregnancy Calculator is designed to help expectant mothers track their pregnancy progress and estimate important dates. This tool calculates your due date, current pregnancy week, and provides valuable information about fetal development milestones.

How Pregnancy is Calculated

Pregnancy is typically calculated from the first day of your last menstrual period (LMP), even though conception usually occurs about two weeks later. This method, called gestational age, is the standard used by healthcare providers worldwide. A full-term pregnancy lasts approximately 40 weeks or 280 days from the LMP.

Calculation Methods

Our pregnancy calculator offers three different calculation methods to accommodate various scenarios:

Last Menstrual Period (LMP) – The most common method used by healthcare providers. Enter the first day of your last period to calculate your due date.
Conception Date – If you know when conception occurred (such as through IVF or fertility tracking), this method provides more precise calculations.
Due Date – If your healthcare provider has given you a due date based on ultrasound measurements, use this to work backwards and determine other important dates.

Pregnancy Trimesters

Pregnancy is divided into three trimesters, each lasting approximately 13-14 weeks:

First Trimester (Weeks 1-12) – Critical period for organ development. Morning sickness and fatigue are common. Risk of miscarriage is highest during this period.
Second Trimester (Weeks 13-27) – Often called the “golden period” of pregnancy. Energy levels typically improve, and you may start feeling baby movements around week 18-20.
Third Trimester (Weeks 28-40) – Rapid fetal growth occurs. Prepare for labor and delivery. Regular prenatal visits become more frequent.

Important Pregnancy Milestones

Throughout pregnancy, there are several key milestones and appointments to be aware of:

Week 4-6 – Confirm pregnancy with home test and schedule first prenatal appointment
Week 8-12 – First prenatal visit, initial blood work, and possible first ultrasound
Week 11-14 – Optional nuchal translucency screening for genetic abnormalities
Week 15-20 – Maternal serum screening and detailed anatomy ultrasound
Week 24-28 – Glucose tolerance test for gestational diabetes
Week 35-37 – Group B streptococcus (GBS) screening
Week 36-40 – Weekly prenatal visits and monitoring for labor signs

Baby Size Progression

Track how your baby grows throughout pregnancy:

Week 8
Raspberry

Week 12
Lime

Week 20
Banana

Week 32
Coconut

Week 40
Watermelon

💡 Did You Know?

Only about 5% of babies are born exactly on their due date. Most babies are born within two weeks before or after the estimated due date, which is considered normal and full-term.

Common Pregnancy Symptoms by Trimester

First Trimester Symptoms (Weeks 1-12):

Missed period and positive pregnancy test
Morning sickness and nausea (affects 70-80% of pregnant women)
Breast tenderness and enlargement
Fatigue and increased need for sleep
Frequent urination due to hormonal changes
Food aversions and cravings
Mood swings and emotional changes
Mild cramping and spotting (implantation bleeding)

Second Trimester Symptoms (Weeks 13-27):

Decreased nausea and increased energy (“golden period”)
Visible baby bump development
First baby movements (quickening) around weeks 18-20
Skin and hair changes (pregnancy glow)
Possible heartburn and constipation
Round ligament pain as uterus expands
Nasal congestion and nosebleeds
Stretch marks may begin to appear

Third Trimester Symptoms (Weeks 28-40):

Increased baby movements and hiccups
Braxton Hicks contractions (practice contractions)
Shortness of breath as baby grows
Swelling in feet, ankles, and hands
Difficulty sleeping and finding comfortable positions
Pelvic pressure and back pain
Frequent urination returns
Nesting instinct and preparation for baby

⚠️ When to Contact Your Healthcare Provider

Contact your doctor immediately if you experience:

Severe abdominal pain or cramping
Heavy bleeding or bright red bleeding
Severe headaches or vision changes
Persistent vomiting or inability to keep fluids down
Signs of preterm labor before 37 weeks
Decreased fetal movement after 28 weeks
Signs of preeclampsia (high blood pressure, protein in urine)

Pregnancy Nutrition Guide

🥗 Essential Nutrients During Pregnancy

Nutrient	Daily Amount	Food Sources	Benefits
Folic Acid	600-800 mcg	Leafy greens, fortified cereals, beans	Prevents neural tube defects
Iron	27 mg	Lean meat, spinach, beans, fortified cereals	Prevents anemia, supports baby’s growth
Calcium	1000 mg	Dairy products, leafy greens, fortified foods	Builds baby’s bones and teeth
Protein	71 grams	Lean meat, fish, eggs, beans, nuts	Supports baby’s growth and development
DHA (Omega-3)	200-300 mg	Fish, walnuts, flaxseeds, supplements	Brain and eye development

Exercise During Pregnancy

🏃‍♀️ Safe Exercises for Pregnant Women

Recommended Activities:

Walking (30 minutes daily)
Swimming and water aerobics
Prenatal yoga and stretching
Stationary cycling
Low-impact aerobics
Strength training with light weights

Activities to Avoid:

Contact sports (soccer, basketball)
Activities with fall risk (skiing, horseback riding)
Scuba diving
Hot yoga or exercising in extreme heat
Lying flat on your back after first trimester

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