Do they know you're pregnant yet?
Honestly, my first thought was "that's the cost of being a bridesmaid, suck it up." That is a crazy expensive expectation for a bachelorette party, but assuming you're okay with it other than paying for alcohol, I'd probably be likely just to pay the standard rate and not say anything. I don't know how the math is breaking down, but I'd feel bad after they sent out the cost coming back and saying "Oh, I won't be drinking, please distribute that cost to everyone else."
Now, if they don't know you're pregnant and haven't factored in that you won't be drinking, you could approach them and say "Hey, I've been keeping this quiet because it's still early, but I'm pregnant. I won't be drinking at the bachelorette party, so I don't know if that changes your cost calculations on alcohol. If it does, can we take that amount off of what I'm contributing?"
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