Don't worry and enjoy the stages.
I worried about Rio's ears since I got him. His ears finally came up at 4 months and 3 weeks old. My advice is to take lots of picks and enjoy the funky stages. Reading about dogs who's ears was up since they got their pup only adds to the worry. To ease people's minds who's pups ears have not stood yet. If your dog was or is a late bloomer, please share when your pups ears stood on their own.