Giving up

Me and my husband have been ttc for going on two years. He's 26 I'm 21. We've had a miscarriage and a chemical pregnancy twice this year. My heart can't handle it anymore and I know my husband feels defeated. Obgyn thinks I have pcos so I know it's my fault. I told my hubby tonight when I go back to the doctor I want to be on birth control so I don't have to worry anymore.. So what's the best kind of birth control out there?