Pregnancy Calculator
Track your pregnancy week by week. Calculate your due date, see baby development milestones, and understand what to expect each trimester.
Formula:Week = (Today - LMP) / 7
Your Pregnancy
Currently
12w 0d
First Trimester
Due Date
Nov 6
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)Friday, January 30, 2026
Estimated ConceptionFriday, February 13, 2026
End of First TrimesterFriday, April 24, 2026
End of Second TrimesterFriday, August 7, 2026
Due DateFriday, November 6, 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
CurrentReflexes 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
Nov 6
196 days to go
Progress30%
Baby is the size of a
Lime
Pregnancy Timeline Insights
Explore how changes affect your results
Week 12 Tips
Based on your results
0/4 completed
⚕️ MedicalImportant
First Trimester Guidance
You're in your first trimester at 12 weeks. Rest when needed and take prenatal vitamins. Morning sickness is common during this time.
⚕️ MedicalRecommended
Baby Development This Week
Reflexes develop, fingernails forming
🥗 NutritionRecommended
Nutrition Focus
Focus on folate-rich foods, stay hydrated, and eat small frequent meals if nauseous.
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.
How this works
Due date is computed with Naegele's rule: LMP + 280 days. Gestational age is derived from LMP; if you have an ultrasound-dated due date from your OB, that one is more accurate.
What this tool can’t do
- Only accurate if LMP is known and the cycle is regular. Early ultrasound dating is the clinical standard.
When to consult a professional
Talk to a licensed healthcare provider before using the output of this tool to make a medical decision, especially if you have an underlying condition, are pregnant, or are on medication that affects metabolism or fluid balance.
Sources
- [1]Centers for Disease Control and Prevention (CDC)Official sourcecdc.govAccessed Apr 21, 2026
- [2]National Institutes of Health (NIH)Official sourcenih.govAccessed Apr 21, 2026
- [3]World Health Organization (WHO)Official sourcewho.intAccessed Apr 21, 2026
Joseph OrdunaFounder & Software Engineer
Full-stack software engineer specializing in embedded systems, web architecture, and AI/ML. Founder of Practical Web Tools. Built the gesture-controlled drone IP acquired by KD Interactive (Aura Drone, sold on Amazon).
Your Pregnancy
Currently
12w 0d
First Trimester
Due Date
Nov 6
196 days to go
Progress30%
Baby is the size of a
Lime