I would totally leave it alone. If it's slightly weaker than planned, so what? It's just more sessionable. This being your first batch, your main goal is probably to prove to yourself that you can actually make drinkable beer, not to hit your intended gravity exactly. Your beer will probably still be great.
Welcome to the hobby!
(Edit: Search around the forum and you will see plenty of discussion as to whether a secondary is even necessary. I only do it for long aging, like a barleywine.)