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 fainting, severe abdominal or pelvic pain, heavy bleeding, or concerning symptoms during a possible pregnancy.
Most nonpregnant people do not need a test immediately after completing treatment if they took the medicine correctly, symptoms have resolved, and reinfection is not suspected.
Testing too soon can detect genetic material from dead bacteria and produce a positive result even though treatment worked.
Arrange a routine or prompt follow-up appointment if:
Seek same-day medical advice for fever with pelvic pain, worsening lower abdominal pain, vomiting, or new pain during sex.
And for anyone, someone who:
This is routine follow-up, not a sign that treatment was expected to fail.
The article also says
Testing again about three months after treatment is generally recommended because repeat infections are common.
If that timing is not possible, retesting should occur when medical care is next available within the following year.
During pregnancy, a test of cure is recommended about four weeks after treatment to confirm that the infection has cleared.
Pregnant patients are also retested later because repeat infection can affect both parent and baby.
Every sign above is quoted from the sofidex article on Chlamydia infections in women. If you are not sure, err upward — it is always reasonable to be checked.