I am overweight and TTC. I'm healthy, except for unexplained low ovarian reserve, which has nothing to do with my weight. I am active, have been losing weight for years. Eventually I'll get to where I want to be, weight-wise.
We've been TTC for three months, in fact this is our fourth. No luck so far, which is expected, because of the ovarian reserve, as well as our mild oligospermia. If we end up needing IVF treatment, I am likely going to have to lose a few pounds faster than what I normally would.
Weight often affects conception. There are many underlying issues that come with obesity. Some could be hormonal, some could be something completely different.
It seems to me that the majority posters on this forum would disagree with me, bu I wouldn't be comfortable in my own skin and wouldn't just wait to see what happens. There are risks during pregnancy as well, when you're overweight or obese. The bad things can affect the mother, the baby or both. And none of these things should be disregarded under any circumstances.
If your doctor agrees, I'd go for a baby. I'd make sure the pregnancy is monitored and I'd stay on a diet and maintain the most of physical activity your body can take. If the doctor says no, then I wouldn't do it until whichever goal is reached.
Personally, I would never ever change my doctor because he or she is not supportive of my weight. My weight is obviously wrong, I'm overweight, if not obese. They have all the right and it's actually their job to tell me to lose weight. A doctor who wouldn't do that, that one I would change right away.
Of course there will be stories about really obese couples conceiving, someone's sister's friend's grandmother's uncle's best friend giving birth to a healthy baby while weighing 500 pounds, but... so what? Does that apply to every case? There are smokers giving birth to (healthy) babies every day, too. But is that the best one can give to their child? I don't think so. There are alcoholics conceiving and parenting. Is that the best environment for the baby? I don't think so.
My weight is my own problem and I am the main reason it exists. My child shouldn't suffer in any way because I am the one who made bad choices at some point.
So I'm trying to do as much as I can to make things better. And to make sure I give my future children the most and the best I can.