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Abnormal bleeding may result from hormonal imbalance, uterine fibroids, cervical/ endometrial cancer or pregnancy complications. The underlying cause should be identified by a gynecologist to ensure timely treatment.

On average, the menstrual cycle lasts from 3 to 7 days. There are pregnancy possibilities even if having sex at any time, but the chances are greater during ovulation, which usually occurs on the 14th day of a normal cycle. If your period started 4 days ago and you have a 28-day cycle, ovulation could be in place now. 

Taking an emergency contraceptive pill (like the i-pill) within a day or two after intercourse may reduce the chances of pregnancy, but it's not a guarantee. If you're concerned about pregnancy, take a home pregnancy test around the time of your expected period.