Pregnant Kaiju

I love this movie, so not trying to say this as a negative thing; it's just an observation. If the Kaiju are all clones of one another and are grown, as they say, there should be no reason why a Kaiju should be pregnant. I guess the only explanation is that Kaiju don't follow the same rules as Earth animals, which kinda need to be fertilized in order to become pregnant, but it seems that in other respects they follow the same rules as our animals. The other argument would be that that one was specifically engineered by the "masters" to be pregnant, but this also seems unlikely. Kaiju seem to be expendable so the idea it would live long enough to give birth is not a certainty and, if they are being cloned anyways, having them able to give birth to more seems to be unnecessary.

Anyways, just an observation.