Welcome!
I can certainly relate to parts of your story - I'm five foot nine and hoping weight loss will help me conceive too! It's a good motivator, I find. If I'm having trouble getting the motivation to exercise, I picture that baby we're hoping to conceive, and remember that's what I'm doing it for, and that's worth the sweat and the aches and the constant battle with the scales.
Good luck, and I look forward to seeing you around.