I think the injury is not severe as there is no swelling,no nasal bleeding
. Minor trauma will not cause any septal deformity
. The crack sound may be due to cartilage. some times nasal bone fracture
will cause crepitus which feels like crack. So dont worry. wait for two days. dont press the nose. If swelling appears consult a ENT doctor.
Hope this will solve your query. Wishing you speedy recovery.