Nope.How about tribbles being literally born pregnant? One throwaway line by Dr. McCoy in an obviously facetious tone, and to some fans it becomes canon.
"Born pregnant " was in no way obviously facetious, especially with the subsequent line about "reproducing at will" and therefore presumably able to impregnate themselves. Under those conditions impregnating themselves while still in the womb is quite plausible.
The tone wasn't obviously facetious; it was obviously flabbergasted.
Born with the potential to impregnate themselves when fed well.
Yep.