Nope, I'm pretty sure your record will be clean. I canceled a GRE general test and there was no record of it on future reports. This still seems to be the rule according to this website:http://www.ets.org/gre/subject/faq/
IMO it's a great idea to register for bother the October and November tests and do what you're planning. I did this and it felt a little bit less stressful in October knowing I'd have another opportunity if it was a disaster... but I didn't need it. So I canceled the November test and got half the $ back.