My female carpet is fairly predictable but my boa will hold onto his waste at times. As a general rule I don't feed any of my snakes until after they eliminate their previous meal.
With carpets, I don't think it is necessary but I do it. With boas it is an absolute key to health.
If you are overly concerned bump your temps a bit and add a touch of moisture for a couple days.
But like the others advised, there is nothing to be worried about.
If you see bloating down the line and there is still no elimination of waste, you should certainly look into it.
For now, stay the course and maybe hold off on food for a cycle if you want.