am I over exaggerating?

So my fiancé little brother just graduated high school last week, my fiancé has been working all week he brought his brother last night and spent the night. Today my fiancé went to work but is getting off early so I'm here with my brother n law and he goes on to tell me that my fiancé told him that he's taking him out for dinner to celebrate his graduation and I'm thinking me and the kids are included so I asked oh where are we going? but then he goes on to say that it's just going to be them two. I felt so dumb, not only because me and the kids aren't included in this but because I had to hear from him. I went upstairs and started to cry I'm 24 weeks pregnant so I'm very emotional. Should I be upset or am I over reacting? This isn't the first time that he doesn't include me in things by the way.