Hello, I can understand your problem, because it is very difficult with this kind of irregular periods. First of all i want to advise you to undergo few hormonal lab tests and pelvic ultrasound by a qualified gynecologist to rule out any kind of pelvic pathology or hormonal imbalance. By taking OC pills, your period will become regular, but after stopping it, if it again becomes irregular, then you must consult a gynecologist and get your reports and ultra sound done. OC Pills will prevent pregnancy, because it is one kind of contraception and because your periods are irregular after stopping pills, it becomes very difficult to estimate the exact time of ovulation and for that you need to do ultrasound. Pregnancy is difficult due to irregular periods and for that your periods needs to be regularize. Chances of PCOD is also there and for that you need to do hormonal work up. sometimes after marriage, periods become regular, but it is not always so. So all and all, i would advise you to stop OC pills now and do hormonal workup and get your ultrasound of pelvis done to find out the cause of irregular menses.