Breeding rabbits

Hi there everyone I’m new here

I have two pet rabbits, one male and one female. They are mixed breed and about 5 months old,
I wanted to breed them before I get them fixed. A few days ago I put them together for an hour to see what happened, the female was willing to mate and the male had about 6 fall offs with loud grunts. They are currently living in separate pens and are doing well. Here’s my questions:

Will she definitely be pregnant?

It will be her first litter, is they’re anything bad that might happen that I should be prepared for?

I just found out today that they are siblings and after reading many online posts about inbreeding I’m terrified my female rabbit will die during labour or the babies will be deformed. Can anyone else comment on this?

thanks to everyone who reads this and answers my questions :)