That's how a lot of 'em do it. However, it's unusual (but not unheard of) for them to get frisky this time of year. Perhaps there is a larger than usual mast crop growing in your area, or they sense winter will be late. 'Cause if they succeed yesterday after your interruption, she will give birth in mid-to-late July. The youngsters wouldn't be on their own until autumn, not giving them much time to establish a territory and cache food for the winter.

Of course, Able & I have witnessed red ones going at it in late August, which is deadly timing for the young unless Mom doesn't mind them living with her through the winter.