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 care sooner rather than waiting for scheduled retesting if a partner is diagnosed with chlamydia or symptoms return.
And for anyone, someone who:
Arrange routine follow-up if symptoms do not improve, return after improving, or worsen.
Persistent symptoms may result from reinfection, missed doses, another infection, or a noninfectious condition.
They should not automatically be treated with another antibiotic without reassessment.
Routine follow-up also includes confirming that partners received care and discussing ways to reduce future exposure.
Condoms, testing before sex with a new partner, and regular screening when recommended can lower risk.
The article also says
Symptoms such as discharge or burning should begin to improve after treatment.
A test of cure, meaning a test to confirm that treatment worked, is not routinely needed for most nonpregnant adults.
It may be recommended if treatment was not completed, symptoms continue, reinfection is suspected, or a less reliable treatment was used.
Testing too soon can detect harmless bacterial material remaining after treatment and produce a misleading positive result.
Because reinfection is common, CDC guidance recommends repeat testing about three months after treatment.
If that is not possible, testing should be performed when the person next receives medical care within the following year.
Every sign above is quoted from the sofidex article on Chlamydial infections - male. If you are not sure, err upward — it is always reasonable to be checked.