Polycystic ovary bleeding 15 days of sex

I have Polycystic ovary so on gynae prescription I take some medicines to have regular meuses but I had periods on 15th March and now it started bleeding again from 2nd April.l had sex on 20th March for the first time and lost my virginity.Although it was a protected sex yet to clear my doubts that am I pregnant I used prega news after 13 days of conception the result was negative.Actually I'm not married yet so I feel I little uncomfortable to discuss about my physical relationship with my family doctor so plzz clear my doubts that is it because of sexual intercourse or Polycystic ovary. The bleeding is light and the blood colour is brownish.The bleeding occurs in spots.l am quite afraid if it would be implantation bleeding.Can a rough intercourse be the reason?