Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services for severe breathlessness at rest, blue or grey lips, confusion, fainting, or an inability to speak in full sentences.
Sudden chest pain or rapidly worsening breathing also needs emergency assessment.
Seek prompt medical advice if diagnosed symptoms are worsening, normal activities are becoming harder, fever persists, or your oxygen reading is lower than the range set for you.
A new fever or productive cough during immune-suppressing treatment may indicate an infection rather than a flare.
Arrange a routine medical appointment if you have a cough or breathlessness that persists, especially if it changes between home, work, or time away.
Mention bird contact, water damage, mold, farming, hot tubs, and dusty or chemical work.
Every sign above is quoted from the sofidex article on Hypersensitivity pneumonitis. If you are not sure, err upward — it is always reasonable to be checked.