Pregnancy Conception Calculator

Estimate when conception occurred based on your due date, last period, or ultrasound

⚠️
📅 Based on Due Date
📆 Based on Last Period
🔬 Based on Ultrasound
March 15, 2026
Estimated Conception Date
When fertilization likely occurred
🎯 Fertile Window / Possible Conception Range
March 10 - March 15, 2026
Possible dates of sexual intercourse
Sperm can survive 3-5 days in a woman's body. This range represents the days when intercourse could have led to conception.
📅 Pregnancy Timeline
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Last Menstrual Period
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💫
Ovulation / Conception
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🔗
Implantation
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👶
Due Date
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💡 Understanding Conception
Conception is the process of becoming pregnant, which involves both fertilization and implantation.
Fertilization
Occurs when sperm meets egg in the fallopian tube, typically 11-21 days after the first day of your last period.
Implantation
The fertilized egg attaches to the uterine wall, typically 6-12 days after fertilization. Pregnancy officially begins at implantation.
Fertile Window
The 5-day period when intercourse could lead to pregnancy. Sperm can survive 3-5 days, waiting for ovulation to occur.