hmmmm....if this has been going on for two weeks I don't think you have to worry! Unless....she already mated with him and won't anymore since she already has. What breed is she? If she is 4 or 5 months she is too young to breed and most likely won't accept a buck. Larger breeds are sexually mature at 8-10 months(sooner in males than females), Smaller breeds 6-8 months(again sooner in males) but the testicles may show earlier than he can breed, I know Hershey was 3 months old when his emerged, same with Sugar, they humped the females, but the females always ran away shaking their tails,growling. Sure Hershey was in the "mood" but he couldn't create babies yet. I've mated rabbits ummm, 6 times I think, 5 times for Spice(but only one successful litter!imagine that!) and Oreo once. They never made any noise and with Spice I had to force her to breed a few times, she would run,growl and attack Cinnamon so I held my hand right over her ears and then she mated. Well I'd say it's about a 50/50 chance of pregnancy.