I am a bit on the heavy side, a little under 200 lbs at 5'0". I have not tried IVF yet, I am hoping to lose 10 to 20% of my body weight before we give it a go....although with my PCOS I have been pretty unsuccessful.
However, I do have a friend who was a little over 300 lbs, and when she told her OBGYN she wanted to head straight away to IVF her dr, she quoted, said "Well, you know you're over 300 lbs right?" My friend, knowing her I should have figured she would say something like this, said, "Huh? When did that happen? Last time I checked I was skinny." Don't really think the dr knew what to say but all in all, she went to IVF straight away. First IVF was a BFN, she was devasted but her insurance covered it so she went ahead with a 2nd IVF. Amazingly, BFP, she has since given birth to a beautiful little girl and she plans to do FET to try for a 2nd to complete her family. I honestly had my doubts, just from what my dr has personally said about my weight preventing me from conceiving, but her success has given me hope.
Hope this helps, best of luck!