I was also overweight for IVF, and it was successful. At my wedding, I was not technically at my ideal weight, but I was maybe 10 lbs away, and wearing a size 8, so I was comfortable with my weight. While ttc, I put on 25 lbs (so that made me maybe 35 lbs over the upper end of my "ideal" weight). My size 12s were getting tight, and I had to go out and buy some 14s

. I was really worried that my weight was going to be an issue. The dr never said a word to me about my weight, and we did get our

. Ironically, I've lost some weight SINCE getting pregnant, so now I"m having delusions that the baby will burn off all my excess fat, and even though I'll get big, I won't get FAT during this pregnancy, and that post-pregnancy, I'll magically come home weighing less than I did when I started IVF, and then only have the 20 lbs of fat I gained ttc to lose. What?? It can happen! It happens to skinny people all the time!
Anyway, my point is I was terrified about getting pregnant when I was already so overweight, and that my body would never recover and I'd never get back to a healthy weight again. I'm now almost 15 weeks, and I'm still down maybe 6 or 7 lbs, so I'm really feeling hopeful that starting out overweight will not be a detriment to me post-partum. Hope that helps!
Losing weight, or at least eating healthy, certainly can only help, but don't put yourself in a panic over it. Do your best to be healthy, and the rest should fall into place. Congratulations on what you've accomplished so far!