Unusually light/irregular period. Steps!

Please don't ask to connect, kindly respond with your advice/resolution. Have 28 days avg regular menstrual cycle. Took ipill on 4 July, LMP: 18 July, expected period: 15 Aug. Had multiple intercourse from 19-25July, mostly protected but 3-4 unprotected episodes with withdrawal/no ejaculation inside. Last intercourse was on 25 July and none afterwards. Estimated ovulation according to tracking app was 31Jul-1Aug. I experienced slight burning while urinating for a few days (resolved itself) then persistent urinary frequency with normal urine volume. On 10th Aug, due to travel I held urine for several hours and while emptying it hurt too much in my bladder. After 1 hr I noticed fresh blood on tissue while wiping (not in blood), after couple of hrs it vanished. Then from 13-15 Aug, observed brown mucus which vanished. On 16th 1 time fresh blood while wiping. On 17 dark red mucus. Took Sotret 10 mg 2 days 13-14th, Satvit plus (stop). Plz suggest possible causes for spotting and next steps