Hello, During the initial couple of months after initiation of oral contraceptives, menstrual irregularities are commonly seen and they range from heavy periods, inter-menstrual bleeding or spotting and prolonged bleeding during cycles. This is due to the abnormal hormonal milieu. Once the body adjusts itself to the new hormone pattern, regularity is established. Since you are very young, your hormone disturbances may be aggravated as you naturally have a tendency to hormonal imbalance at this age. Please contact a specialist for a proper appraisal of your situation and if necessary, switch to some other form of contraception. Take care.