Not an expert regarding rabbit breeding at all, but did have my first experience with kits. Since I started with a First Time Mom (unproven) didn't know what to expect. Did see my buck fall off twice, but still didn't know if it "took". The number of falls per breeders, is 3. About two weeks after the bucks "fall", Luna started to dig constantly. Starting moving hay all over. I didn't really believe she was pregnant until the night she kindled. Saw my first Hay mustache. I know others palpate their does at 14 days to see if they can feel the kits. I didn't because I was nervous and didn't want to hurt the doe or her kits, if any were in there. But breeders do it all the time, so it really is just me and my nervousness.
I have found after reading LOTS of info, that all does are individuals and will either show signs (nest building) or will show no signs and you wake up to kits. There is no set rules for pregnant does. I think they just love to keep us guessing. lol.
With a short pregnancy (31 days to 36 days) it's not a long wait to see. But have to say, the first wait is very nervous, but truly exciting time.
Hope you get your first litter soon.
Karen