My fiancé lost his job a few months before our wedding date. Should we postpone?

Not necessarily; what needs weighing is his ability to provide basic maintenance (nafkah) after the akad, not the size of the celebration. Sit down and talk it through together calmly. Ask about his savings, job prospects and roughly how long he needs to get back on his feet. If a big celebration has become a burden, scale it down and keep the date of the akad. If he cannot yet cover basic needs at all, postponing for a few months is not a failure. Allah says: “whoever's provision is restricted, let him spend from what Allah has given him” (Surah at-Talaq 65:7). So what matters most is his attitude: is he making an effort to find work and being honest about his situation? Your support at this time can become a strong foundation for your future household. See a fiancé without steady work.