Cook the pancetta in a large soup pot over medium heat about 5 minutes, do not brown.
Add olive oil to the pancetta, carrots and onion (or leek), and chard stems. Cook about 10 minutes, stirring occasionally and adding the garlic about half way through the time. Add 1 tablespoon tomato paste; stir to cook it.
Add drained tomatoes, water, broth, zucchini and yellow squash, and potato. Simmer 15 minutes over medium low heat. Add chard leaves, oregano, salt and pepper, and pasta. Simmer 10 more minutes, remove from heat, and let sit a few minutes w/the lid on before serving.