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 new breathing difficulty, severe chest or abdominal pain, bloody vomit or stool, fainting, confusion, seizures, rapidly increasing neck or limb swelling, or other signs of sudden deterioration.
Contact the treating team promptly if symptoms return, a skin lesion or swelling worsens, fever develops, or medicine side effects make it difficult to continue treatment.
Before stopping an antibiotic, contact the clinician or public health team that arranged it.
Follow-up depends on whether a person was treated for confirmed disease or received preventive care after an exposure.
Routine follow-up may include checking that symptoms are resolving, monitoring skin healing, reviewing laboratory results, and watching for medicine side effects.
People recovering from severe anthrax may need additional care for weakness, breathing problems, wound healing, or effects on the nervous system.
Public health officials may also follow up to clarify where the exposure occurred, identify potentially exposed people, and confirm that preventive treatment has been completed.
This does not mean the infection is spreading from person to person.
The article also says
Take prescribed antibiotics for the full recommended period unless the treating clinician changes the plan.
This is especially important after inhalation exposure because spores may become active after a person initially feels well.
Attend all vaccine appointments if vaccination is part of the public health plan.
Every sign above is quoted from the sofidex article on Anthrax. If you are not sure, err upward — it is always reasonable to be checked.