Bring a large pot of water to a boil and cook the whole wheat spaghetti according to package directions until al dente.
While the pasta cooks, whisk together the whole egg, egg whites, and grated Parmesan cheese in a small bowl until the mixture is uniform.
In a large skillet over medium heat, sauté the diced pancetta for 5-7 minutes until it becomes crispy and the fat has rendered.
Add the minced garlic and frozen peas to the skillet with the pancetta, cooking for 2 minutes until the garlic is fragrant.
Reserve 0.5 cup of the starchy pasta water, then drain the spaghetti and add it directly to the skillet, tossing to coat the noodles in the pancetta drippings.
Remove the skillet from the heat and immediately pour in the egg mixture while tossing the pasta constantly with tongs to create a creamy sauce.
Slowly add the reserved pasta water a tablespoon at a time as needed to reach your desired sauce consistency, ensuring the eggs do not scramble.
Season the dish with freshly cracked black pepper and sea salt before serving in a warm bowl.