According to the symptoms (irregular cycles and infertility) it seems that you aren't ovulating and can be the reason for sterility. Irregular cycles are typical for women who are not experiencing ovulation. Lack of ovulation is also a reason for sterility. Birth control pills are given for regulation of the menstrual cycle. Birth control can make the cycles regular, while a woman is taking the pills. Birth control pills don’t stimulate ovulation. In fact, they dampen ovulation. Nonetheless, it is believed that ovulation can be established spontaneously after a woman stops taking birth control altogether. The hormones from the birth control pills somehow awaken the hypothalamus to produce the chemicals necessary for the production of ova, or eggs. If birth control pills don’t help stimulate ovulations, a stronger prescription-based ovulation stimulator can be taken (clomifen).