I did not significantly change my diet at all.
For the last two weeks I tried to eat more veggies, but that was more diet than IVF Diet. I also ate a lot less sugar for the same reason.
What did change? I had MUCH less stress. Last cycle I had just finished a job that caused me to break out in hives. Plus I was dealing with a dying FIL. This cycle my job is fantastic and luckily everyone I love is in good health. And of course the first IVF is so much more stressful than the second. This one has kind of flown by since I not only know what to expect, but I know it's not that bad.
I also really upped my vitamins. A LOT more vitamin D, Calcium, Fish Oil and Folic Acid than just what's in the Prenatals. Once again, this wasn't just for IVF, but for health in general.
Finally the biggest thing was just a change in protocol. I did antigone this time with no Lupron. There were other changes too, but I have a feeling Lupron was my downfall. I stress MY downfall, because what drugs work well for you is very personal.
Hope this helped though I bet it doesn't. I realized reading post after post with titles like "IVF BFPs What Did You Do?" the answers are so damn varied. I really wish there was a right way and a wrong way. Just today I spent hours reading about how much bedrest people did before they got BFPs.... it ranged from "I was gardening day of transfer" to "one full week I didn't leave the bed". As I type this I'm sitting next to a giant glass of grape juice cause I read somewhere that's supposed to help implantation. I doubt it does, but we're just so desperate to do whatever we can.
I hope whatever you do it's the perfect thing for you.