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:
Contact the treating clinician promptly for a returning fever, worsening sweats, new localized bone or joint pain, joint swelling, jaundice, repeated vomiting, or new testicular pain or swelling.
Pregnant people with a possible exposure or symptoms should seek timely medical advice.
Suspected laboratory exposure requires prompt occupational health and public health assessment, even before symptoms develop.
Follow-up helps the care team confirm that symptoms are improving, check for medicine side effects, and look for evidence of a complication or relapse.
The timing and tests needed depend on the type of infection and treatment used.
Keep follow-up appointments and tell the clinician if symptoms remain unchanged, worsen, or return after treatment.
For this reason, clinicians do not usually interpret follow-up blood tests without considering symptoms, examination findings, and previous results.
The article also says
Fever may improve before tiredness, appetite, and strength fully return.
Joint or back discomfort can also take time to settle.
A positive antibody test may persist even after successful treatment.
After recovery, reduce the chance of another exposure by avoiding unpasteurized dairy products and using recommended protective equipment around animal tissues and fluids.
If the exposure occurred at work, the employer or occupational health service may need to review safety procedures.
Every sign above is quoted from the sofidex article on Brucellosis. If you are not sure, err upward — it is always reasonable to be checked.