Is my bunny pregnant?

i have three bunnies. They were at a 4-h meeting where we were handing them and letting little kids touch them and play with them. One of my bunnies who is a girl was being held outside and so was another bunny who was not mine but looked a lot like her and is a boy. Anyways, when i went to put one of my bunnies away i found the boy bunny who looked like my girl on top of my other gir bunny in the run. I am guessing he had been on there for about 10 to 20 seconds and i grabbed him and took him off. When i did my gir bite me. So do you think she is pregnant?