The absolute worst part of the 2ww for me is the stupid progesterone supps. They are probably the most disgusting things ever. Also, I am terrible at remembering to take them. I don't have too much trouble remembering in the evening, but the morning dose gets me every time. I can't even count how many times I have been in the car on the way to work before I remember I forgot the supp again. Luckily I have always remembered when I'm still in range of the house so I can turn around.
Wish me luck remembering!