According to Scribner and the Hemingway archives, he actually wrote 47 endings, and the alternate versions will be published together in a new edition next month. Are any of them cheerier, you might be wondering? Do Catherine and the baby get a second chance? Here's a sample: "That is all there is to the story. Catherine died and you will die and I will die and that is all I can promise you."
There's also a Fitzgerald-suggested line about how the world "breaks everyone." So: No, is the answer.