Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Seek emergency care for severe or rapidly worsening pain, a cold or discolored hand or foot, loss of sensation or movement, uncontrolled bleeding, breathing difficulty, or signs of compartment syndrome.
Contact the treating clinician promptly for increasing pain or swelling, a cast that feels too tight, persistent numbness, new weakness, skin irritation, fever, wound drainage, or pain that is not improving as expected.
Follow-up appointments allow the care team to check alignment, skin condition, circulation, movement, and healing.
Repeat imaging may be needed.
Keep these visits even if the injury feels better, because pain may decrease before the bone is strong enough for unrestricted activity.
The article also says
Ask when it is safe to bear weight, return to work or school, drive, and resume exercise.
Follow instructions about cast removal and rehabilitation.
Removing or adjusting a cast without professional guidance can disturb healing.
After a fracture caused by a minor fall or everyday movement, especially in midlife or later life, ask whether evaluation for osteoporosis is appropriate.
Fall prevention, vision care, medication review, strength training, and home safety changes may help reduce future injuries.
Every sign above is quoted from the sofidex article on Broken bone. If you are not sure, err upward — it is always reasonable to be checked.