Induction changes?

I am suppose to get induced next Tuesday at 3:00 am. However my doctor gave me a card with his number to call two hours prior to make sure that everything is still on and nothing has changed in regards to cancelling. Has this ever happened to anyone else? I've booked my flight for my mom to be here specifically that day as she is unable to stay long.

Are there any specific reasons why doctor may change it? Please help.

Thank you!