Different doctors recommend different times to wait...12 months, 18 months, 24 months, etc. I all depends on YOU, how much weight you have to lose, etc. The best bet is to ask your doctor and see what he/she recommends.
Definitely use birth control!

As soon as you start losing weight your fertility will skyrocket. Don't risk your health or that of your baby by becoming pregnant too early. I've heard that birth control pills aren't as effective for us because of the malabsorption issue, so you'll need to use condoms as well.
As for me, we waited 15 months before we started trying. I was pretty shocked that I got pregnant the very first month, because I didn't think it would happen that easily because I'm a little older. After years of having PCOS, my obstetrician now refers to me as "Fertile Myrtle".
