Hello.I'm not positive but I think the pharmacy that I deal with(mom and pop) would count it as a refill and fill it on the 27th day.
My pharmacy will fill prescript
ions 3 days early but my Pain Management always writes a Fill Date on the prescript
ion which is 30 days.
I wasn't much help/Maybe someone else can give you a more definitive answer.
Rick
eta: Since the last prescription you got was a 15 day supply you may have to wait 2 or 3 more days.Doesn't hurt to ask them though.