non-humanoid pregnancy »
This term refers to situations in which a character has been impregnated by something unusual. For example, art depicting a character giving birth to puppies would be a non-humanoid pregnancy.
This category also includes characters with a womb full of eggs, eels, or terrifying alien parasites, even though they may be better described as hosts rather than being "pregnant".
The term "non-humanoid" has been used instead of "non-human" because this tag is not intended to cover elves, catgirls, or other nearly-human creatures. A judgement call might be necessary for creatures that are technically humanoid but grotesque.
This tag applies only to impregnation with life forms, not bellies swollen with something else. That would be inflation, which has a variety of sub-genres. For example, a stomach or uterus full of semen is an example of cum inflation.
See also
Creature inside is similar, but a bit more specific.
Some animals, including many insects, use an appendage called an ovipositor to lay eggs. In some species, it is used to inject eggs into another organism. See the tag oviposition for more biology pulled from your nightmares.
Some common causes of non-humanoid pregnancy:

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