I feel like I’m being selfish

I’m due September 17th and as we all know babies have a mind of their own. She could come sooner or later. But my sister in law is getting married September 24th. We didn’t plan to get pregnant and were shocked . So I’ve been worried about how this is all going to pan out . From the start of finding out my husband had told her if I have the baby he will go. I want him to go and don’t want him to miss his sisters wedding. I would feel awful if he did as it’s just the 2 of them, it’s his only sister , and their mother passed away last year. I don’t care if he goes once I have the baby since my mom will be coming to help me. But if I haven’t had her I hate to say it but I don’t want him to go. I feel like she isn’t taking this seriously because she’s still letting him go through with being in the wedding and isn’t acting like me having a baby is an issue . Especially after their conversation yesterday . I’m getting even more worried . I really don’t think he would leave if I haven’t given birth . But the talk made me second guess that. He was making comments how the second one isn’t as important ( he didn’t mean it how it sounds) . Just that I guess he wouldn’t feel he missed too much because it’s the second and he’s already experienced it. Then made comments about not wanting to leave me alone . So don’t ? But then I feel selfish and shitty about it . He also made the mistake of telling her I might get induced ( which hasn’t even been decided) . So I feel like they are both making decisions based off of that. I don’t want to get induced again so if I don’t have too I’m not doing it. I also don’t think it’s fair to me and the baby to only get induced to he can for sure make it to her wedding . Then again I feel selfish for having that mind set . His sister has always had a way of manipulating him into doing what she wants , even if it’s something different then what I want and concerns me , he will give in to her . I’m hoping this isn’t something that ends up like that. Am I being crazy by not wanting him to go if we don’t have the baby by then? Since this is literally his only sibling . I feel she should be keeping this all in mind and preparing for him to possibly not being able to go. I don’t know what to do, should I start making arrangements for someone else to be with me during delivery if he’s not going to be there ? I don’t want to do it alone .