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Your burning during micturition and frequency of urination points to wards strong possibility of UTI ( Urinary Tract Infection
), this infection could be after your sexual activity.
You should consult a doctor and get Urine analysis R&M with bacterial culture and sensitivity, and take plenty of fluids and water to dilute and flush urine, and doctor will prescribe specific antibiotics and if required after culture report may be switched to more suitable drug.
If you have pain can take a paracetamol
tablet to reduce pain,and fever.
Taking cranberry juice and antiseptic like Pyridium may help.
You have mentioned taking I pill please understand this drug is emergency contraceptive pill
and not regular contraceptive pill and should not be used for purpose of routine contraceptive.
Please use barrier methods
which protects from unwanted pregnancy
as well as sexually transmitted diseases.