I’m a Jewish woman in the Middle Ages… 🤔

Let’s say I’m a Jewish woman living in the Middle Ages. My husband goes off to war and people think he died, so I end up marrying someone else and have a child with him. But then, six months later, my first husband comes back (he actually survived!) So… who am I really married to? And what happens to the kid? How would something like this have been handled back then? 🤔