Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
CHH itself rarely causes an emergency.
Contact the treating clinician promptly for significant treatment side effects, unexpected bleeding, new severe mood symptoms, or major changes in sexual or reproductive function.
Seek urgent medical assessment for a new severe headache, sudden vision change, fainting, confusion, repeated vomiting, or severe weakness.
These symptoms are not typical of stable CHH and could indicate a different pituitary, neurologic, or medical problem.
Routine follow-up checks whether treatment is supporting pubertal development, sexual health, bone health, and personal goals.
Visits may include a review of symptoms, growth or body changes, blood tests, and treatment effects.
Bone-density monitoring may be appropriate when hormone deficiency was prolonged or other bone risks are present.
Arrange a routine appointment if puberty has not started when expected, pubertal development begins but does not progress, menstrual periods do not begin, or there are concerns about sexual function or fertility.
A reduced sense of smell or a family history of delayed puberty may be useful information to mention.
The article also says
People planning a pregnancy should discuss fertility treatment early.
Genetic counseling may also be useful before pregnancy, although genetic results cannot always predict whether or how severely a child would be affected.
Every sign above is quoted from the sofidex article on CHH. If you are not sure, err upward — it is always reasonable to be checked.