As hard as it is, it would probably be best to try to loose some of the weight first. (age permitting) IVF is so emotionally and financially draining, you really want to set yourself up with the best chance of sucess from the beginning. For me that was to loose 15kg, give up caffine, sugar and alcohol, see a nutritionalist and get fit and start appropriate nutritional supplements and get some dental work done. All this took a year, but I was 33 at the time. If you are older, it may be better to start strait away. I have a great FS that worked with me on all this. Now 32 weeks ;-) Goodluck!!