need ttc and weight loss help.

Kayci
plus size 19 year old about 240lbs. is it possible for me to become pregnant at this weight or not. obgyn said I have to lose weight and that I'm pretty much too fat to have a baby. trying to become pregnant this year with fiancé, going to start eating better and going on walks, but it is hard for me to lose weight due to thyroid issues.
looking for advice on weight loss and ttc. thank you ladies.