Bowel movement can happen anywhere between a few days after a meal to several week so obviously you should not wait until your animal poops to feed again.
Now since the animal has not been eating for 3 months the majority of the prey you will offer for the next few week will be utilized for growth leaving little to nothing to be eliminated.
Additionally if you are under feeding this animal this will not help either.
Keep in mind that an hatchling out of the egg can take down a hopper mouse or rat fuzzy with no issue, obviously if this animal has not ate in 3 months it is not an hatchling out of the egg.
You need to feed a prey that is equal it's girth size (largest par of your BP's body)
Both your threads have been merged in an effort to keep the forum clutter free, no need to post the same thread multiple times just be patient and wait for answer (not everyone is up at 1 am to answer threads). Thank you