Ive worked black friday 9 months pregnant. Its really not that bad. Just make sure you snack when you can and drink lots of water. It does go by quick!
I worked retail on Black Friday for 7yrs. I only worked the register once in that time, but I agree that it might be the best place to be when you're pregnant. Also stores open so early & even the night before in some cases that you might luck out & not have as many customers as you anticipate.
I worked retail on a black friday once. I worked register so it wasn't bad at all. There wasn't time for a break between customers but the hours went by super fast. If you're able to work register that is where I would ask to be.
You might want to tell your manger you feel a little uncomfortable so he/she can put you in a low flow area so you feel more comfortable (:
Just take your time and do the best you can. That's all you can do :) you'll be fine!
Put a sign saying CAUTION: pregnant on you or something lol that way people know