Getting pregnant and weight

I’m about 268lbs 5’3 and me and my SO are TTC. I’m currently slowly loosing weight due to a diet change and only water drink and have been wondering just how long it will take us to get our BFP. It’s already been a couple cycles and I would like to know how much harder it is going to be for me to get pregnant and will I even show? That’s me please share your story’s and suggestions