Of course there is still hope Acria.

Overweight ladies have babies all the time and ladies who are not overweight have recurrent miscarriages. Yes weight can be a contributing factor, but not the only possibility. Don't blame yourself. By blaming yourself you will only feel worse about the situation and make things worse.
You are doing a great job by aiming to loose some weight. Perhaps seeing a natropath now will help you with this goal.
I found acupuncture great, i can't be 100% sure it helped with my m/c's, but i am pretty certain it did.

I wish you all the best of luck in your TTC journey, never give up hope, there is always hope.