Pregnancy Test Calculator
Find the best time to take a pregnancy test for accurate results
Calculate Pregnancy Test Timing
First day of your last period
Average length of your menstrual cycle
If known, this will improve accuracy
Typical Pregnancy Timeline
Natural Conception Timeline
Day 0: First day of last menstrual period
Day 14: Ovulation (for 28-day cycle)
Day 14-15: Fertilization window
Day 20-23: Implantation occurs
Day 24-26: hCG production begins
Day 28: Missed period, recommended test date
IVF Timeline
Transfer Day: Embryo placed in uterus
1-5 days later: Implantation occurs
7 days after transfer: Earliest reliable urine test
9-12 days after transfer: Blood test confirmation
Note: IVF medications can affect test results
Test Sensitivity Guide
Lower numbers = earlier detection capability
⚠️ Important Notes
• Testing too early may give false negatives
• Blood tests are more sensitive than urine tests
• IVF medications can affect test results
• Irregular cycles make timing less predictable
• Always follow up with healthcare provider
🏥 Medical Disclaimer
This calculator provides estimates only and should not replace professional medical advice.
Consult your healthcare provider for pregnancy confirmation and prenatal care.
Individual results may vary based on personal factors.
Understanding Pregnancy Tests
How Pregnancy Tests Work
Pregnancy tests detect human chorionic gonadotropin (hCG), a hormone produced by the placenta after implantation. hCG levels double approximately every 48-72 hours in early pregnancy.
Types of Tests
- •Urine tests: Convenient, available over-the-counter
- •Blood tests: More sensitive, performed by healthcare providers
- •Digital tests: Clear results, often more expensive
Timing Considerations
Best Time: Day of Missed Period
- Natural conception: Wait for missed period for best accuracy
- IVF conception: Follow clinic guidelines (usually 7-14 days after transfer)
- Early testing: Possible with sensitive tests, but higher false negative risk
- Irregular cycles: Consider ovulation date if known
Remember: A negative test doesn't always mean you're not pregnant - it might just be too early.
Factors Affecting Test Accuracy
Factors That May Cause False Negatives
- • Testing too early
- • Diluted urine (too much fluid intake)
- • Expired or faulty test
- • Certain medications
- • Ectopic pregnancy
Factors That May Cause False Positives
- • Fertility medications containing hCG
- • Recent pregnancy loss
- • Certain medical conditions
- • Chemical pregnancy
- • Rare medication interactions