My sisters bachelorette

Ashley
I'm 29yrs old. Pregnant with my first child. I'm due October 1st. My younger sister is engaged & is having her bachelorette party next March. We live in San Diego & she is having it in miami. Is that normal to leave your baby at 6months? I can't think for the life of me im going to want to leave my baby. But my sisters not an understanding person and thinks I'm going to be there. Do momies usually leave their babies at that age? And when mommies do leave their babies, what age is it usually at? Personally, I don't even want to go to her bachelorette!! I don't even like the guy she's marrying😞😞