Welcome, and congrats on your first BP.

Yes, your BP is probably just checking things out and getting acclimated to his new surroundings. Probably a combo of exploring and stressing from all the change. Nothing to be worried about. If your BP starts exploring all day/night then it is time to make some husbandry changes.

I agree with the others who have said cancel the appointment. The less moving of the snake the better for your snake.
Also, I would agree with redshepherd that the fecal is suggested for wild-caught animals. It almost sounds like the vet was telling you to bring the animal because the vet is running a business. Vet visits = money to the vet, and yes, unfortunately, many vets think business minded before what's actually best for the animal.

Let your BP get settled in, leave it alone to get acclimated and feed on his normal schedule and you should both be fine.

Good luck, we're here when/if you have more questions. Keep us posted!

Oh, and make sure that enclosure is SECURE!!!! They are sneakier than you think, stronger than you might think, can fit through smaller openings than you may think and WILL escape if they can.
We don't want to see your next thread as one of the many "missing snake" threads.