Bring a large pot of water to a boil and cook the high-protein spaghetti according to package directions until al dente.
While the pasta cooks, dice the pancetta and place it in a large skillet over medium heat, sautéing until it becomes crisp and golden-brown.
In a small bowl, whisk together the whole egg, egg whites, and grated parmesan cheese until the mixture is smooth and well-combined.
Add the zucchini noodles to the skillet with the pancetta during the last 2 minutes of cooking to lightly soften them.
Reserve a small amount of the starchy pasta water, then drain the spaghetti and add it directly to the skillet with the pancetta and zucchini.
Remove the skillet from the heat immediately to prevent the eggs from scrambling, then pour in the egg mixture.
Toss everything vigorously, adding a splash of the reserved pasta water if needed, until the sauce thickens into a velvety coating.
Season the dish with sea salt and black pepper before serving immediately while hot.