Bloody mucus discharge on day 17 of cycl

Hello mam my few LMPs 19th january 6th march 8th april 19th may my name is reena 20 years old , unmarried , sexually active with known partner LAST MONTH PERIOD 19th MAY I am treated with cystic acne and advised acniklin 20mg 1-0-1 for one week after i started this medicine i felt headache and fever from 29th MAY and i had protected intercourse done on 2th , 25th ,26th of MAY (LMP 19thMAY)   now on 3rd JUNE i have felt wet panty and sensation in clitoris and NO CRAMPS on 4th june i have got brownish mucus discharge at night without cramps and also it turns mucus with red blood today on 5th JUNE my query .. is this bleeding indicates egg fertilization or implant bleeding? or it is a side effect of ACNIKLIN , or this is ovulatory bleeding? please clear it mam / sir..