pregnancy birth calculator

🤰 Pregnancy Calculator

Last Menstrual Period (LMP) Conception Date Ultrasound Date IVF Transfer Date Known Due Date

Completed

Remaining

Key Dates

Baby Development

Health Check

Recommendations

Pregnancy Term & Due Date

Pregnancy refers to the period—typically around 9 months—during which one or more offspring develop inside a woman. Childbirth usually occurs approximately 38 weeks after conception or 40 weeks after the last menstrual period (LMP). According to the World Health Organization, a full-term pregnancy typically ranges between 37 and 42 weeks.

During a person’s first OB-GYN visit, the estimated due date is often determined via ultrasound or based on the LMP. Our Pregnancy Calculator provides accurate estimates using the due date, last period, conception date, ultrasound date, or IVF transfer date.

Note: While due dates provide a useful estimate, only 4% of births occur exactly on the due date. About 60% happen within a week, and 90% within two weeks of the estimated date.

Pregnancy Detection

• Home Pregnancy Tests: Detect hCG hormone in urine, available over-the-counter
• Clinical Tests (Blood or Urine): Detect pregnancy 6–8 days after fertilization, offering more accuracy

Common early symptoms include a missed period, fatigue, nausea, and increased urination.

Pregnancy Management

Medication Safety

Category	Description
Category A	Safe for use during pregnancy
Category X	Known to cause fetal harm - avoid completely

Weight Gain Guidelines

Pre-pregnancy BMI	Recommended Gain
Underweight (<18.5)	28–40 lbs
Normal (18.5–24.9)	25–35 lbs
Overweight (25–29.9)	15–25 lbs
Obese (30+)	11–20 lbs

Exercise Recommendations

• 30 minutes of moderate exercise daily
• Low-impact activities like swimming or walking
• Pelvic floor exercises
• Avoid contact sports and hot yoga

Essential Nutrients

Nutrient	Daily Requirement	Food Sources
Folic Acid	400-800 mcg	Leafy greens, fortified cereals
Iron	27 mg	Lean meat, beans, spinach
Calcium	1,000 mg	Dairy products, tofu
DHA Omega-3	200-300 mg	Fatty fish, walnuts

Medical References

1. American College of Obstetricians and Gynecologists. (2023). Pregnancy Nutrition Guidelines
2. World Health Organization. (2022). Global Pregnancy Care Standards
3. National Institute of Child Health. (2021). Fetal Development Timeline
4. International Journal of Gynecology. (2020). Exercise During Pregnancy
5. Journal of Maternal Health. (2019). Medication Safety in Pregnancy

Pregnancy Timeline

First Trimester (Week 1-12)

• Organ formation
• Heartbeat begins
• Morning sickness common

Second Trimester (Week 13-27)

• Fetal movement begins
• Gender visible
• Energy levels increase

Third Trimester (Week 28-40)

• Rapid weight gain
• Lung development
• Braxton Hicks contractions