I think you may be being kind of hard on yourself. I mean, you climbed a mountain last weekend? I climbed a mountain, once. It was not a tall mountain but it tuckered me out for a week! I was getting pain in muscles I didn't know I had! That's what happens when you over-exert yourself!
Since you are trying to get pregnant, why not schedule a well woman checkup with your ob/gyn? Get nutritional advice & a checkup to get your body as healthy as it can be for pregnancy. Could it be that you are already pregnant? I know plenty of women with belly fat who have gotten pregnant, so I don't think that alone is going to prevent you from getting pregnant.
I agree stress might be a factor. Even happy events like being newly wed can have their stressors. Take things one step at a time. Good luck!
My Sparkpage is set to private, but I'm open to SparkMail!
"People often say that motivation doesn't last. Well, neither does bathing--that's why we recommend it daily." - Zig Ziglar