If a multiverse exists, it is indeed possible that another universe could have come into existence before ours. The concept of a multiverse encompasses the idea that there may be multiple universes or regions of space-time, each potentially with its own set of physical laws and conditions.
Within certain theoretical frameworks, such as eternal inflation or cyclic models of the universe, the multiverse scenario allows for the possibility of universes undergoing cycles of expansion and contraction or continuous creation. In these scenarios, it is conceivable that other universes could have formed prior to our own.
However, it is important to note that our current scientific understanding of the multiverse is still largely speculative and based on theoretical models. While there are intriguing ideas and mathematical frameworks proposing the existence of a multiverse, definitive empirical evidence to confirm or refute it is currently lacking.
As our knowledge and understanding of the universe continue to evolve, future observations and theoretical advancements may shed more light on the nature of the multiverse and the possibility of pre-existing universes.