Not my expertise. But, it may be a good idea to just start creatine now. Since the 15s enhances pump, circulation and glycogen upload, it's probably ideal to fill up on creatine and and saturate the muscles before hitting the 2nd half of 10s.
So creatine may not do much for hypertrophy now. But, your muscles will be raring to go once you hit that phase.
cheers,
Jules