I don't know if BPs are different than other snakes when it comes to defecating... but my corn snake will poop once or twice after a feeding, depending on the week. Sometimes it's one large a few days after eating, and sometimes she'll go once then again right before feeding day.
:S
Sorry I can't be of more help.
Don't let anyone, ever, make you feel like you don't deserve what you want. - Heath Ledger