How old is your rabbit? Females should be breed for the first time before they get too old, because after a certain age if they are not breed their pelvic bones can fuse, which makes it very difficult if not impossable to safely have babies. If you breed a female for the first time when she's older, even older than a year old, then your risking the life of the female as well as the babies.
Also, I don't recommend breeding if you don't know the history of both of the potential parents. If you just got them from a
pet store, then how do you know they're not carriers for genetic diseases that could be passed onto their babies?
There are thousands of rabbits in shelters already, by breeding your rabbit your taking potential homes away from rabbits sitting in shelters.
Also, some studies have shown that 2/3, or about 80% of unspayed female rabbits die by their 5th birthday due to uterine cancer that could have been completly prevented by spaying.
Really thing carefully about breeding her. And if you decide too, make sure to do plently of research so you know what to expect before the babies arrive.