Hi there I have my Neutered male rabbit in with a potentially pregnant female.?

I need some advise. My female rabbit BB was introduced (briefly) to an entire Harlequin Lop named Harley. They are kept in separate cages and remain seperated. However, we have a neutered male, Wabby who lives with BB (the potentially pregnant).. Is this going to pose a problem? BB has been plucking her fur out like crazy and lined the secluded spot in the hutch, and has been a bit more flighty. She has also started to 'hump' Wabby, and jump over him over and over again.. IS this normal, is she perhaps having a false pregnancy? She met (briefly - 5 minutes) Harley the entire rabbit about 3 weeks ago. Her behaviour changed a couple of days ago. Has anyone got some advise for me? This is my first time with a potentially pregnant rabbit.