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Can I conceive another child if I am already pregnant?

Diana Meeks
Diana Meeks on behalf of Sigma Nursing
Family Practitioner

In a word, yes!!  This phenomenon is called Superfetation. Such pregnancies occur when a woman continues ovulating after becoming pregnant, and the second, fertilized egg is able to implant itself in the lining of the womb. Usually, hormonal changes prevent further ovulation and thicken the lining of the uterus to prevent a second embryo from attaching. Superfetation can occur if a woman was born with 2 uteruses, or if a different menstrual cycle occurs during a woman’s pregnancy. Medical literature says Superfetation is rare in humans and describes less than 10 cases known world-wide. It can occur spontaneously, or from artificial insemination. Usually the multiple pregnancies will be delivered at the same time, but there will be a noticeable difference in the size of the infants. A potential complication is that one of the infants [in the case of twins], will be born prematurely and may have problems with lung development. The premature infant may also experience other health complications associated with being born prematurely. True Superfetation can only be confirmed after delivery, by chromosomal and metabolic studies on the infants.

Once a fertilized egg is implanted in the womb, your hormone levels change so that no other eggs will be released from your ovaries.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.