I was on Weight Watchers for most of 6 months before getting my BFP (through IVF).
I am only 12 weeks along, so not sure I am having any crazy cravings yet.
I haven't been eating for 3 or 4 but as someone else said, i am definately not second-guessing every bite I take as I might have pre-pregnancy. Went to the doctor, and I only gained 1 pound between 6 weeks, but he said that I should be gaining more in the 2nd & 3rd trimesters for sure.
I haven't had cravings yet or anything, but I'm just trying to get more fruits and veggies into my diet (I've always been HORRIBLE at that!) and cutting down on my soda consumption.