My period was four days late summer started two days ago. i bled for two days and then a little on the third stopped for a day and now spottin on day5?

Changes in bleeding: This can occur for many reasons from hormonal imbalances, stress, infection, pregnancy, bleeding disorders, medical disorders, growths..... If it becomes a pattern over 3 months, then follow up with gynecologist. If associated with heavy bleeding more than a maxipad full an hour, fever, odor, chills sweats, shortness of breath, pain then follow up ASAP or ER