For pregnancy to happen, the following events are essentially needed:
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Production of sperm and ovum (egg cell)
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Release of a mature egg from the ovary (ovulation)
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Fusion of male sperm and female ovum (fertilization)
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Implantation of a fertilized ovum to inner lining of uterus
When you take i-pill Daily contraceptive pills on a regular basis, ovulation or the release of egg is suppressed. In the absence of an egg, conception is avoided.