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https://www.invitra.com/en/wp-content/uploads/2018/07/risks-of-superfetation.png24001020Superfetation is the simultaneous occurrence of a pregnancy when you are already pregnant. The odds in humans are extremely low, with only 10 recorded cases in history. It should not be confused with superfecundation, which is the fertilization of two eggs at the same time, resulting in fraternal twins.