This close to the procedure, I would assume that your symptoms are related to traumatized nerves. If after a few more weeks your sensation is not returning, you may want to have some tests. But even then, it may be too soon. It can take a very long time for nerves to repair themselves, and it depends on the degree of damage. In most cases, it is related to swelling from the procedure, which is minor damage, and resolves more quickly. More severe damage can take up to a year to regenerate. Only after that long wait can you assume it is permanent.
Of course, up to a year is too long to be messing your pants. That is why I said to give it a few more weeks to begin turing around. If it becomes intolerable, you can opt for a temporary ileostomy while you wait out the healing process. That is not an uncommon option.