Bring a large pot of salted water to a boil and cook the whole wheat spaghetti until al dente.
In a medium bowl, whisk together the eggs, egg whites, parmesan cheese, and black pepper until the mixture is smooth.
In a skillet over medium heat, sauté the pancetta until it is golden and crispy.
Add the minced garlic to the skillet and cook for 30 seconds until fragrant.
Reserve 0.5 cup of the starchy pasta water, then drain the spaghetti.
Add the hot pasta to the skillet with the pancetta and garlic, tossing to coat the strands in the rendered fat.
Remove the skillet from the heat and quickly pour in the egg mixture, whisking or tossing constantly to create a creamy, velvety sauce without scrambling the eggs.
Thin the sauce with a few tablespoons of pasta water if needed, then garnish with fresh parsley and sea salt.