G'day Chelsey,
PMI has not yet announced when the exam for Edition 7 will be available and currently recommend Edition 6 as per the link below.
www.pmi.org/certifications/certified-associate-capm
I come from a strictly IT background, so I know from experience, that navigating all of the threads can be a challenge. If you are not in a hurry then one option is to study the Edition 7 until the exam becomes available. However, if do need your CAPM sooner, then go for the Edition 6.
I have also contacted PMI directly last week, on behalf of someone else and was unable to get a solid confirmation on the lead time that they will provide ie; 6 months according to the website.
I am sorry that I cannot provide a better answer. I have my CAPM, however I am hoping that a PMP might also jump in with their input for you.