hi, i am 20 years old, and for the last 3 months my partener and i have been trying for a baby. i have always had regular periods, lasting 5days on a 28day cycle, but in the last 10 weeks my cycle has suddenly changed dramatically. in the last 10 weeks i have had 5 periods each lasting 7 days, they have all been very heavy and quite painful, with only 7days between each period. what could be causing this? is this normal or could there be something wrong.? will i still be ovulating? could this be a sign of pregnancy? ovarian cancer? or is it normal for this to happen?