the fertilization of an ovum in a female mammal already pregnant.

1595–1605; < Latin superfētāt(us) (past participle of superfētāre to conceive again while still pregnant, equivalent to super- super- + fētā(re) to breed (see fetus) + -tus past participle suffix) + -ion

superfetate, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
superfetation (ˌsuːpəfiːˈteɪʃən)
physiol the presence in the uterus of two fetuses developing from ova fertilized at different times
[C17 superfetate, from Latin superfētāre to fertilize when already pregnant, from super- + fētāre to impregnate, from fētus offspring]

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There's even a name for what happened: superfetation, or conceiving while pregnant.
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