What Causes Miscarriage In Women With Polycystic Ovaries?

Hi I am 34with 2 kids.I was diagnosed with poly cystic ovary in March 2014 when my periods were late for 3months. After that for 9months I got my periods on time or just 10-15days late then on December I got pregnant and had a miscarriage on 22jan and the bleeding lasted till 6feb.after that till today I didn t get my periods nd my doc prescribed me primolute n for 14 days twice daily. Yesterday I started taking this med. she also told me to come in fasting for two tests I forgot test names. But 1is to check the kidey function and other one for sugar production level in my body. I am overweight swelling on my feet and ankles. I try on and off to reduce weight but can t reduce. What should I do I m very upset.