Hi Paulette,
Yes, it is normal. I had the same thing and my OS said it is completely normal. The achiness came and went for a while but at this point it is gone.
If you think about it...it should hurt a bit. They are actually breaking a bit of the bone to use for the plug.
I wouldnt worry about it too much. I'm sure the pain will subside as the bone heals.
Take care,
Kathleen