Hi, Cycloreg is not recommended for producing withdrawal if there is a suspicion of pregnancy. You may use Medroxyprogesterone instead. Post delivery, ovulation resumes usually around 3-6 months, but if there is much delay like you have, it could be due to a hormonal imbalance. Lactation, excess weight gain, stress and emotional disturbances could be causative. Please ask your doctor about the possibility of pregnancy before you take the medicine. Take care.