I can’t say what it could be from the pics, but it’s good that she is eating/drinking/pooping normally. As long as she is eating/pooping, she should be ok until she goes to the vet tomorrow.

It appears your little girl is a boy. The bean-sized lump looks very much like a testicle. There should of course be 2 testicles, but they might not drop at the same time. Sometimes one testicle won’t drop at all.
Baby buns are very difficult to sex, so this actually happens rather a lot ?

The first picture makes it look like a testicle a lot more clearly than the second. It looks pretty bang on to the picture I posted when Wick’s descended, and it was indeed a teste: https://binkybunny.com/FORUM/tabid/54/aft/160503/Default.aspx

** Also, I’ll add that you shouldn’t feel weird about sexing a rabbit incorrectly. It’s pretty difficult to do considering when they’re young, the hallmark sign is the shape of the urethra and the presence of two small nubs that will become testes. These monikers are very small and at some points are not yet developed when someone checks a rabbit, so incorrectly sexing rabbits is pretty common!

Whoops, is it that obvious? In my defense, I could only take a quick scrolling-page glance since my computer is surrounded by other co-workers . Well, congrats it’s a boy! At least “Moki” is a gender neutral name so you won’t have to change his name.

Your he is most definitely a she, and you should get him neutered soon to stop any hormonal behavior.

Yep, that is very much a testicle and he is very much a little male

I want to add that Ive been in your same position! When I was younger, my mom thought my rabbit was a girl. My mom saw two lumps in my rabbits thighs and let me know that she was going to the vet with my bunny, and that she may not come home with “her”. My mom thought it was a fast forming cancer growth  When my mom brought my rabbit home, she sighed, set my rabbit in front of me, then busted out laughing. I learned what testicles are that day, LOL.