I am poly cystic ovarian. What are the chances of me having a child naturally? I have already lost my left ovary. I am 20. I am not on any medications or birth control.

Chances good. With pcos, women have irregular periods and don't ovulate every month, but many women with pcos ovulate sometimes, and thus get pregnant. If you don't get pregnant in a year without using birth control, talk with your doctor, or if you are skipping 2-3 months at a time. Fertility medicine can help. If you are overweight, losing weight can help overall health and fertility.
Your. Your chances depend on whether you are ovulating regularly or are interested in using medication to help your ovaries ovulate if not. By natural, I suspect you mean spontaneous conception without medication. You can use ovulation prediction kits, available at most pharmacies, to predict when you are ovulating. If these do not indicate regular ovulation there are a variety of medications to help you ovulate. Also, with pcos, (polycystic ovarian syndrome) women have Insulin resistance. You can decrease your Insulin resistance and increase your chance of conception with regular exercise, 30 minutes per day.