My rabbit had a litter today and both was stillborn could she still be pregnant?

If she is still housed with her brother she can get pregnant again immediately after giving birth. If she is housed with her brother he needs to be removed and kept in a separate hutch. It is not good for brother and sister rabbits to breed with each other.Sometimes rabbits can be pregnant with 2 litters at the same time if she was not separated from the buck during pregnancy