When my endocrinologist and (former) OB/GYN told me that the reason I hadn't been able to conceive, after a year of trying, was my weight. I was devastated, and my choices were really only to either a) cry and feel sorry for myself, or b) do something about it. I chose the latter, and have never looked back.
The funny thing is, we recently found out that my weight WASN'T the problem. After finding out in June that I was pregnant, we went through several weeks of h*ll before it was recognized that my pregnancy was ectopic, and that both the ectopic pregnancy and my infertility were due to severe endometriosis.
I wish I hadn't had to go through the emotional pain of hearing that I couldn't get pregnant because I was too fat, and of feeling like my infertility was all my fault. But the upside is that it motivated me to lose weight (something I'd never seriously attempted before), and because of that I am now well on my way to a healthy weight range for IVF - which will greatly improve my chances of conceiving that way, and will make for a much healthier pregnancy.