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 confusion, fainting, severe weakness, difficulty breathing, blue or mottled skin, or other signs of severe illness.
Seek prompt, same-day medical advice for:
These symptoms can occur with sepsis and should not wait for routine follow-up.
And for anyone, someone who:
Routine follow-up is especially useful if infections keep returning, there is ongoing difficulty emptying the bladder, or urinary symptoms continue despite negative cultures.
Keep a record of symptom dates, test results, antibiotics, and possible triggers.
This can help a clinician look for patterns.
The article also says
Symptoms often begin to improve after treatment starts, but the timing varies.
Follow the prescriber’s instructions about when to make contact if symptoms remain unchanged or become worse.
Another urine test or a change in treatment may be needed.
For recurrent infections, prevention depends on the person’s situation.
Options may include avoiding spermicides, addressing incomplete bladder emptying, or using vaginal estrogen after menopause when appropriate.
Some people may be offered clinician-directed preventive antibiotics.
These choices require a discussion of benefits, side effects, and antibiotic resistance.
Every sign above is quoted from the sofidex article on Bladder infections in teens and adults. If you are not sure, err upward — it is always reasonable to be checked.