Most BP's will only defecate after shedding, as long he doesn't look like he has a 'sausage butt' you have nothing to worry about and should continue to feed, my BP hasn't defecated since the 28th of july, but he is fine as long as the husbandry is ok and he is eating i am sure he is ok.
As you can see how many times i have fed my BP since he last defecated:
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