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, fainting, confusion, trouble breathing, a rigid or markedly swollen abdomen, or signs of severe illness.
Contact the treating team promptly for fever, worsening abdominal pain, repeated vomiting, inability to drink, increasing wound redness, pus-like drainage, or pain that is not controlled as expected.
These concerns need timely advice and should not wait for a routine visit.
People treated with antibiotics without surgery need a clear follow-up plan.
They should understand which symptoms may signal persistent or recurrent appendicitis and whom to contact if symptoms return.
Follow-up may also include reviewing imaging findings or discussing whether later surgery is appropriate.
Routine follow-up after uncomplicated surgery usually focuses on healing, return to activity, and any pathology results from examination of the removed appendix.
The timing and format of follow-up vary by healthcare system and individual recovery.
The article also says
After surgery, follow the care team’s instructions for wound care, bathing, activity, driving, work or school, and pain control.
Keep the incision clean and monitor it for increasing redness, swelling, drainage, or opening.
Appetite and energy may return gradually.
Walking is often encouraged, but heavy lifting and strenuous activity may need to wait until the surgeon says they are safe.
Recovery may take longer after perforation, an abscess, or an open operation.
Every sign above is quoted from the sofidex article on Appendicitis. If you are not sure, err upward — it is always reasonable to be checked.