During ovulation i had unprotected sex and a week after ovulation i started spotting(lasted for a day) and i got heavy cramping than 9 days after that i got my periods...could there be something wrong?

Happens sometimes: Many women have occasional variation of their menstrual period timing, some spotting between periods, a heavier or lighter period, a longer or shorter period, or even a missed period. Having one of these symptoms doesn’t necessarily mean a medical problem, but a visit to one’s primary care or Ob-Gyn doctor is a good idea if symptoms are persistent, recurring, or worrisome.