A rabbit can pretty much get pregnant anytime, this article is from
www.rabbit.org
Please spay/neuter your rabbits, its better for their health and keeps the over population thats already a terrbile issue under control.
Rabbits reach sexual maturity between three and six months of age. A rabbit differs from other mammals in that the female ovulates after being mounted by a male. This is called induced ovulation. This is the only time she produces an egg. This also means that after a rabbit has given birth, if the male is still present, she can and most likely will become pregnant within 24 hours of giving birth. Just imagine how you would feel if you had a baby and within 24 hours you were pregnant again!