Not to worry is a blanket statement and does not apply to all BP it depends on the age with a young BP the #1 cause of refusal is husbandry, and the wrong prey being offered.
Since you provide very little info such as weight of the animal and husbandry I will just refer you to this. https://ball-pythons.net/forums/show...-hatchling-101
Do this to a T, if the animal is young getting it to eat ASAP is very important, young BP should be voracious if not there is something not working out.