Chicken behavior around the nest, hoarding and staying in the nest puffing and hissing, is a better indication of broodiness.
Yup! These are my go-to signs that a bird is broody:
Is she on nest most the day and all night?
When you pull her out of nest and put her on the ground, does she flatten right back out into a fluffy screeching pancake?
Does she walk around making a low cluckcluckcluckcluckcluck(ticking bomb) sound on her way back to the nest?
If so, then she is probably broody and you'll have to decide how to manage it.
my chicken has laid 12 eggs in one nest. a rooster is in the pen with her. how long do I wait to see if shes going to hatch them?
Don't wait. Gather eggs daily.
Better to use fake eggs for 'enticement', tho that may be futile.
Oh, and....
Welcome to BYC! @ba41842
Where in this world are you located?
Climate, and time of year, is almost always a factor.
Please add your general geographical location to your profile.
It's easy to do, (laptop version shown), then it's always there!