Constipation is actually VERY VERY rare does your BP have a bulge near the vent are?

BP do not go on schedule they go when they need to, it can be every week, every month or more.

What goes in must go out, if your BP is not eating there is nothing to eliminate.

Defecation is related to food intake, a juvenile will utilize most of the prey item for growth if the food intake is no adequate there will be very little left to be eliminated.

Do not soak your BP unless it is REALLY necessary in other words a bulge near the vent that does not go away.