I confused two ideas when asking a question, and I want to edit it to reflect what I actually meant. But two people already answered and I'm not sure if I'm allowed to do that. Can I? I'd hate to spam a new question so soon.
Once a question gets answer(s) it is preferred that any edit doesn't invalidate them, out of respect for those who put effort in writing them and to avoid that a QA site turns out into a forum where edits keep chasing the answers.
And then, if the question you wrote and got answers to isn't really the question you actually wanted to ask, you can always (carefully!) ask a new question. The only caveat here is to make sure the new question that you had meant to ask is substantially different from the question you originally asked. Otherwise, your new question will be closed for being a duplicate.