Fiancé wants to go to Vegas too close to due date

Ok so... I'm pretty sure that I'm thinking correctly when I say that my fiancé is legitimately insane! His brother is planning a trip to Vegas September 12th and I'm due October 7th. Is it crazy that I'm furious about my fiancé going? Honestly it has nothing to do with Vegas because I sent him there in January for his birthday. It's just the fact that he will be a plane ride away so close to my due date. Am I just going crazy, or would you be flipping out too???