Pregnancy Conception Calculator
The Pregnancy Conception Calculator estimates the date of conception based on the expected due date of the pregnancy, last period date, or ultrasound date. The date of conception is the day on which a person's baby is conceived. The calculator also estimates a possible range of days during which sexual intercourse might have led to conception based on sperm being viable for 3-5 days within a woman's body.
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About Conception Calculation
Conception Date: The date of conception is typically calculated as 14 days after the first day of your last menstrual period (LMP). This assumes a 28-day menstrual cycle with ovulation occurring on day 14.
Ovulation: Ovulation usually occurs around day 14 of a 28-day cycle, but this can vary. The egg is viable for about 12-24 hours after ovulation, while sperm can survive in the female reproductive tract for 3-5 days.
Fertility Window: The most fertile period is typically 5 days before ovulation through the day of ovulation. This calculator estimates the possible range of intercourse dates that could have led to conception.
Understanding Conception and Pregnancy
The Conception Process
Conception occurs when a sperm fertilizes an egg. This typically happens in the fallopian tube within 12-24 hours after ovulation. The fertilized egg then travels to the uterus and implants in the uterine lining about 6-12 days after conception.
Pregnancy Dating
Pregnancy is dated from the first day of your last menstrual period (LMP), not from conception. This is because the exact date of conception is often unknown, while the LMP date is usually known. This means you are considered "2 weeks pregnant" at the time of conception.
Factors Affecting Conception
Several factors can affect the timing of conception, including cycle length, stress, illness, medications, and lifestyle factors. The calculations provided are estimates based on average cycles.