Period watery and heavy ? its also 7days late;not sexually active,

Heavy periods: The longer your period, the thicker the lining and therefore the heavier the period. This is not necessarily abnormal but does increase your blood loss and can result in anemia "iron poor blood". You can use the birth control pill to help this or try ibuprofen or naprosyn (naproxen) starting on a scheduled basis 3 days before your period.