anyway to salvage my first all grain brew?

[Miraculix]

Great advice thank you!
When I take my sparge sample should I see a different reading than my initial reading? I would have assumed that the wort from the mash first running would have a higher gravity than the sparge sample?

That's correct. Just measure the gravity of the combined runnings after thorough mixing.

Some people brew different beers from the different runnings, but I wouldn't bother with that technique now. Just keep it in mind for later as a possibility to brew two different beers from the same batch.