Hi, I have gone through your query and understood the concern. Since you have been on the hormone contraception, your cycles are protected. However, during the initial months, it is preferable to use additional protection. Menstrual disturbances ranging from heavy and/or prolonged periods, inter-menstrual bleeding, scanty periods and absent periods can be seen. This corrects once the body adjusts to the altered hormone levels. Your symptoms are not specific only for pregnancy; they can also be seen with hormone imbalance. Please get further help from your health care provider. Take care.