What if the clone was more suave when he went to Lois's place, and she didn't realize that he wasn't Superman until the next morning? Or, even more awkward, she doesn't realize until after the clone dies and she talks to Superman. Then the clone dies, and Lois is stuck with what is genetically Superman's baby but isn't actually his.
Would Clark tell Lois his secret identity and be the daddy? Would Superman try to be a father-figure? Would Clark, without telling her? Would he resent Lois or the baby (even if he tries not to resent the baby) for sleeping with the Clone and not realizing it wasn't him?