Blood bleeding. And what's the reason.

Hello, my concern is "Every month i use to get periods month of last week in the date of 18 or 19 starts , but unfortunately this month I got periods in the beginning of the month 4th , which has never happened to me anytime though I had unprotected sex with my fiance and took an iphil before 2 times and d 5days cycle ended on 8th ...9th and 10th I had a unprotected sex with my fiance.. And I didn't take any pills at that time ... 10th I started blood bleeding like a drops again 12th I had a same unprotected sex and took a iphil tablet and the same I was a getting a drops of blood bleeding a week continuously and then today 19th I got a periods like a thick blood is today ...this month from 4th periods nd got ended on 8th living the gap of two days didn't happend anything ..im getting blood bleed continuously... can u give me any solution why this as happening and what's the reason . Thanks!!