Not having period for more than six months is considered a case of "amenorrhea" and should be treated. A hormonally active cyst could cause amenorrhea and it is definitely a reason for sterility because it interrupts ovulation.
I recommend you find a good gynecologist that will examine your hormone status (FSH, LH, estrogen, progesterone, prolactin, thyroxin), the uterine and ovarian tubes (HSG, laparoscopy, hysteroscopy, ultrasound), and check you for an STD. Your husband can also take a spermogram first to exclude the possibility of a low sperm count, also resulting in sterility.
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