What Are The Side Effects Of Contraceptive Pills?

im having frequent urination and it feels painful in the end. most of the time i have only small amount of urine. is this could possibly the side effect of the contraceptive pill im taking? it is my last tablet this day, and i only had this feeling after i had dry mouth when i wake up one morning. because of dry mouth i drink a glass of water to soothe my throat and mouth, then i urinated almost the same amount as i drunk and i drink again to replenish then i urinated almost the same then i had frequent urination.