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Pleco's aren't livebearers meaning they'll never become pregnant, and assuming that's a common pleco it's still much too small to have reached sexual maturity.
Pleco's cant get pregnant they lay eggs. It might just be eating a lot and is bloated, it is also to small to have reached sexual maturity. Pleco's Also need drift wood in the tank to help pass and digest food(algae/flakes/wafers).