I have been using Heroin for 8 months now and for the past 4 months my menstrual cycle has stopped completely. I was just wondering if anyone had some comments on this, for example: Is this normal? Can I still get pregnant? If so, is it safe to use birth control? What exactly is going on..am I still producing eggs, etc.? If I ever quit using Heroin will my menstrual cycle return to normal?