Hi Lionfish. I wasnt really really strict when doing ivf, i still had a bit of choccie and diet coke (I know naughty!!!) but def a no to alcohol. Choc and the occasional diet coke was the only caffeine that i had, and i made sure to have good diet of fruit and veg, but nothing super super strict. I think its important to feel good about yourself and also for you to be able to relax as much as you can whilst doing ivf. Not too much exercise after the embryo transfer, and just do what you can when you can, and try not stress to much. Your body should pretty much tell you what feels right and what feels good.
I wish you all the luck
Mel