My doe is doing the same thing at five months. Made a complete nest. Spent the next two weeks ignoring it. This can apparently be triggered by a hormone rush from another rabbit and it usually tells you... They're ready to be bred! I'd wait a while to make sure it's not something crazy happened (like breeding through a cage wall which happens) and then you can breed her.
..it was kind off odd. both of my New Zealand whites were bred on the same day, and then both had false pregnancies exactly 2 weeks later on the same day lol! go figure! It was really a bummer...I want to invent preg test for rabbit im suprised they havent yet...Ya know little sticks like "keto sticks" that you could catch the pee on lol lol lol it would make ALOT way for easier for ALL of us wouldnt it...I waste so much time waiting for kits, cause re breeding is never 100% and neither is Early nest building which could resemble a false pregnancy. Just imagine knowing after 1 or 2 weeks, That would save soooo much time if they didnt take lol
Are you sure they're not mini lops?