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You must know how pregnancy works to use the pregnancy due date calculator effectively. The ovary releases an egg (ovulation) on the 14th day of a regular 28-day menstrual cycle. The sperm should fertilize an egg within 12 to 24 hours of ovulation to conceive a baby. Therefore, determining the ovulation date can help estimate the date of conception. The date of conception, in turn, will help predict the due date. However, selecting the exact ovulation date is impossible, unlike in-vitro fertilization (IVF).
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