Question about Bachelorette Party!!

Ok, so I am approaching my 2 month mark and know my shower is coming up soon. And I have seen a lot of discussion on here about bachelorette parties. I SO want one, and not sure if I should be the one to plan it or will my BP do it? I don't want to ask them b/c I don't want them to assume they have to pay more $$ nor do I want them to have more to worry about. My BP consists of 5 girls, of which 2 ore OOT and 2 do NOT have the money to do one more thing! I had a friend, who is not in the BP say she wants to go to my Bachelorette Party, but I am not sure what to do?!?!

I want to ask one of my BM, but I don't want her to assume I am expecting it!!! WHAT TO DO!?!?!