"Seasonal" is a brand of contraceptive pills that prevent pregnancy but also reduces the number of menstrual periods. It seems that you don’t need any contraceptive pills because your tubes are tied and you can’t get pregnant. It doesn't seem that you can use Seasonale only to have fewer periods per year. Periods that occur during the use of Seasonale are unpredictable and can have a larger amount of bleeding. Other side effects of Seasonale are same as from other birth control pills.