Female rabbits (does) should usually be retired from breeding at the age of 2 or 3. If your rabbit has been in the company of a male recently, then it may be likely that she has become pregnant. Due to her age, it may be that she cannot conceive, or that the pregnancy will not reach full term. The gestation period is normally around 31 days, and long before this she will become swollen and will begin to build a nest. She will need added nutrition and bedding.