Pregnancy Calculator

Track your pregnancy week by week. Calculate your due date, see baby development milestones, and understand what to expect each trimester.

Your Pregnancy

Currently

12w 0d

First Trimester

Due Date

Jun 24

196 days to go

Progress30%

Baby is the size of a

Lime

Enter Your Information

If unsure, use the date from your pregnancy confirmation or ultrasound dating.

Week 12 Details

Baby Development

Reflexes develop, fingernails forming

Baby Size

Lime

Your Body

Morning sickness may ease

Pregnancy Timeline

First TrimesterSecond TrimesterThird Trimester

Key Dates

Last Period (LMP)Wednesday, September 17, 2025
Estimated ConceptionWednesday, October 1, 2025
End of First TrimesterWednesday, December 10, 2025
End of Second TrimesterWednesday, March 25, 2026
Due DateWednesday, June 24, 2026

Development Milestones

4

Poppy seed

Implantation complete, placenta forming

5

Sesame seed

Heart begins to beat, neural tube forming

6

Lentil

Facial features forming, arm/leg buds

8

Raspberry

All major organs developing, fingers forming

10

Prune

Embryo becomes fetus, vital organs functioning

12

Lime

Current

Reflexes develop, fingernails forming

14

Lemon

Can make facial expressions, gender visible

16

Avocado

Can hear sounds, skeleton hardening

18

Bell pepper

Vernix coating forming, active movement

20

Banana

Halfway point! Hair growing, lungs developing

22

Papaya

Eyebrows and eyelids formed

24

Cantaloupe

Viability milestone, lungs producing surfactant

26

Lettuce head

Eyes opening, brain developing rapidly

28

Eggplant

Can dream (REM sleep), blinking

30

Cabbage

Gaining weight rapidly, brain growing

32

Squash

Practicing breathing, bones hardening

34

Pineapple

Vernix thickening, fat accumulating

36

Honeydew

Most organs mature, head may engage

37

Winter melon

Full term! Ready for birth

38

Pumpkin

Organs fully mature, gaining antibodies

40

Small watermelon

Due date! Baby is ready

Trimester Overview

First Trimester

Weeks 1-12

  • • Major organs forming
  • • Morning sickness common
  • • Fatigue and mood changes
  • • First prenatal visit

Second Trimester

Weeks 13-26

  • • Energy returns
  • • Baby bump visible
  • • Feel baby movement
  • • Anatomy scan (week 20)

Third Trimester

Weeks 27-40

  • • Rapid baby growth
  • • Braxton Hicks contractions
  • • Prepare for delivery
  • • Nesting instinct

Your Pregnancy

Currently

12w 0d

First Trimester

Due Date

Jun 24

196 days to go

Progress30%

Baby is the size of a

Lime

Quick Answer

Pregnancy lasts 40 weeks from last menstrual period (LMP). Due date = LMP + 280 days. First trimester: weeks 1-12. Second: weeks 13-27. Third: weeks 28-40. Our calculator tracks all milestones.

Key Facts

  • Pregnancy = 40 weeks from LMP
  • Due date = LMP + 280 days
  • Only 5% deliver on due date
  • Full term: 39-40 weeks
  • Three trimesters of ~13 weeks each
  • Key milestones at specific weeks

Frequently Asked Questions

The due date is calculated using Naegele's rule: add 280 days (40 weeks) to the first day of your last menstrual period (LMP). This assumes a 28-day cycle and ovulation on day 14. Only 5% of babies arrive on their exact due date.
First trimester (weeks 1-12): Major organs form, highest miscarriage risk. Second trimester (weeks 13-26): Baby grows, movement felt, generally easiest trimester. Third trimester (weeks 27-40): Rapid growth, preparation for birth.
Weight gain depends on pre-pregnancy BMI. Underweight: 28-40 lbs. Normal weight: 25-35 lbs. Overweight: 15-25 lbs. Obese: 11-20 lbs. Most weight gain occurs in the second and third trimesters.
First-time mothers typically feel movement (quickening) between 18-25 weeks. Experienced mothers may feel it as early as 13-16 weeks. Early movements feel like flutters or bubbles. By week 28, you should feel regular movement daily.
Common tests include: blood type/Rh factor, glucose screening (gestational diabetes), Group B strep, genetic screening (NIPT, quad screen), anatomy ultrasound (18-22 weeks). Your provider will recommend tests based on your health and preferences.

Medical Disclaimer

This calculator is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always consult with a qualified healthcare provider before making any health-related decisions.