Legacy with active sister, rushing in the fall

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Hi, I'm new to greekchat, and I'm rushing in the fall at a big state school with competitive greek life. My older sister is a junior at the same university I'll be attending and plegded a sorority her freshman year. From what I know about it, I like her sorority and would probably be happy with it, but I want to have a chance to make my own decision. I'm afraid I won't be able to make my own decision once other sororities see I am a double legacy (grandma as well) at this sorority, and that all the sororities I'm interested in except this one sorority will cut me and I'll really have no say in what house I join. I've heard if you're in this situation (with an active sister), you have to cut the sorority really early in order to have a chance of pledging another sorority. I don't want to do this, as I am interested in my sister's sorority. What are your all's thoughts? Has anyone been in/ known someone in this situation and what happened? Thanks in advance!