Hi. I am old enough to be your mother, but my advise is this.
If you are healthy, even though you are overweight, and you continue to eat healthy and exercise, you will be fine. Not everyone in the world is slim and trim and all kinds of babies are born everyday to women who are overweight. Overweight may not mean unhealthy.
Just a thought, so if it was me, I would go ahead and start a family. I WOULDN'T allow myself to eat anything and everything during pregnancy as it will be really hard to carry all the extra weight. You don't say what your health issues are.
Anne