Male rabbits will mount anything that moves and a lot of things that don't. I can't say to an absolute certainty that your little doe isn't pregnant, but it would be extremely unusual. Rabbit does don't generally enter adolescence before about 12 weeks of age; if your doe is capable of conceiving at her age, she's a very unusual rabbit. Most of us separate by gender at no later than 10 weeks just to give ourselves a little 'wiggle room.' But when it comes to rabbits, "the act" only takes a couple of seconds, so if you don't want to have a litter, you need to make sure male and female rabbits are kept completely separate.
