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What human power-ups/power-downs would you choose? Why?
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Now that I think about it - cows do have uteruses. Do they get periods in some way too?
The tldr is not every species with a uterus menstruates.
Most animals' bodies don't convert into a child bearing state until they're already pregnant. Dogs and cats for example don't grow breasts (or line their uterus) until they're pregnant. Humans (and a few other species) evolved to just be ready to raise a child at any time, which results in permanently developed breasts and a continuous refreshing of a uterine lining.