looking for answer to this

[ontheoutside]

i went today and bet on the derby future pool
i noticed it said it was open from thursday to sunday
the horse that i bet was 12-1
my question is
am i locked in with my horse at 12-1
or after sunday is complete
do thay tabiolate all the money and come out with new odds on monday and whatever my odds are from there is what i got?
thanks