TTC weight loss disappointment

Katie🐼 • If at first you don`t conceive... Try, try and try again !
I had a doctors appointment this morning. 
I went to talk to eat about planning TTC 
And while she was very optimistic about that and said to give it until Christmas / new year before and they will look to sending me for tests and then referring me to the fertility clinic. Which makes me feel a lot better. 
I also said I wanted to lose weight to make it easier and safer. Her answer to that was use TTC as an incentive but there's not a lot I can do to help you just have to eat healthy and exercise. She then got me to get on the scales (every woman's worst nightmare ...someone else seeing how much you weigh ) and I had sky rocketed since the last one 4months ago and she seemed a bit concerned about that but still said nothing can do. I told her I do eat healthy and I do exercise but just doesn't seem to be doing anything except the opposite of the desired effect. I seem to be gaining what I feel I'm burning off 
I asked to go on metformin as that helped loads last time but I got told it's not licensed for that so therefore she can't do it. 
I just came away feeling a bit mixed. 
I feel on the one hand. Great they're going to help me TTC but on the other hand they won't because I need to Lose weight but I just physically can't. 
I don't suppose this is a question more I just needed to get it off my chest. Unless anyone has any advice then please because I feel at my wits end with it at the moment.