Last month i had a normal heavy period and just a week later bled lightly for seven days again. ?

Hormonal Changes?: Assuming you've had no major chemical changes lately which could throw off your hormones -- such as changing your birth control method or dose -- something could have naturally affected your glandular system. Stress, sex, love, food...All mess with us. Or, you might have had a larger blood clot in the uterus which didn't make it all the way out. Instead, annoyingly, it "bled" for a week.