I didn't realize/remember that your bog was fully "operational" yet.
In that case, I would not worry about a little lawn fertilizer run off going into the pond. Whatever gets circulated through then bog is going to help those plants.
My only advice (which I am sure that you know) is that a week without water is too long for new sod. If you don't have good rains in the forecast while you are away, do you have any family members or a neighbor kid that can water your sod and newly-seeded grass? Hate to see your most recent hard work wither and die.
