Tools in This Collection
Pregnancy Week Calculator
Calculate your due date and current pregnancy week from last menstrual period or conception date
Pregnancy Weight Gain Calculator
See recommended weight gain ranges by pre-pregnancy BMI and trimester per IOM guidelines
Ovulation Calculator
Estimate ovulation date and 6-day fertile window based on your average cycle length
Period Calculator
Predict next period date, ovulation day, and fertile window up to 12 months ahead
Contraction Timer
Track contraction duration, intervals, and frequency during labor to know when to go to the hospital
Guides & Articles
Pregnancy and Reproductive Health Workflow
Whether you're trying to conceive, newly pregnant, or approaching your due date, tracking the right metrics at each stage helps you stay informed and prepared. These tools cover the full reproductive health journey from conception planning through labor. These tools are for informational purposes only. Always consult your healthcare provider for medical guidance specific to your pregnancy.
Trying to Conceive: Timing and Tracking
Conception requires timing intercourse during the fertile window — typically the 5 days before ovulation and the day of ovulation itself. For a 28-day cycle, ovulation occurs around day 14. But cycles vary significantly between individuals. The Ovulation Calculator estimates your fertile window based on your actual cycle length. The Period Calculator projects future cycle dates, fertile windows, and ovulation days up to 12 months ahead.
Early Pregnancy: Due Date and Milestones
Once pregnant, the Pregnancy Week Calculator determines your estimated due date from your last menstrual period (LMP) or conception date, and shows your current week with trimester stage. The standard due date is calculated as 280 days (40 weeks) from the LMP, though only about 5% of babies are born exactly on their due date — most arrive within 2 weeks before or after.
Weight Gain Guidelines
The Institute of Medicine (IOM) provides weight gain guidelines based on pre-pregnancy BMI: underweight women (BMI < 18.5) should gain 28-40 lbs; normal weight (18.5-24.9) 25-35 lbs; overweight (25-29.9) 15-25 lbs; obese (30+) 11-20 lbs. The Pregnancy Weight Gain Calculator tracks current gain against these ranges by trimester.
Late Pregnancy: Contraction Timing
The 5-1-1 rule guides when to go to the hospital: contractions every 5 minutes, lasting 1 minute each, for at least 1 hour. The Contraction Timer automatically calculates frequency and duration as you log each contraction, displaying the pattern in real time.
Frequently Asked Questions
How accurate is an ovulation calculator?
Ovulation calculators are most accurate for women with regular, predictable cycle lengths. For cycles that vary significantly month to month, the fertile window estimate may be off by several days. The calculator provides a useful planning framework but shouldn't replace physical methods like basal body temperature tracking or LH surge tests for higher accuracy.
How is the due date calculated?
The standard due date (estimated date of delivery, or EDD) is calculated as 280 days (40 weeks) from the first day of your last menstrual period. This assumes a 28-day cycle with ovulation on day 14. Your OB or midwife may adjust the due date based on first-trimester ultrasound measurements, which are more accurate than date calculations alone.
How much weight should I gain during pregnancy?
The Institute of Medicine recommends: underweight (BMI < 18.5): 28-40 lbs; normal weight: 25-35 lbs; overweight: 15-25 lbs; obese: 11-20 lbs. For twins: add approximately 10 lbs to each range. Gaining within the recommended range reduces risk of preterm birth, gestational diabetes, and cesarean delivery.
When should I go to the hospital during labor?
The general guideline for first-time mothers is the 5-1-1 rule: contractions every 5 minutes apart, lasting 1 minute each, for at least 1 hour. For subsequent pregnancies, labor often progresses faster and many providers recommend going sooner. Always follow your specific OB or midwife's instructions — they may have different criteria based on your pregnancy risk factors.
What is the fertile window?
The fertile window spans the 5 days before ovulation and the day of ovulation itself — 6 days total. Sperm can survive in the female reproductive tract for up to 5 days, but the egg is only viable for 12-24 hours after ovulation. Intercourse in the 2-3 days before ovulation has the highest conception probability.