Many senior posters will say that AP scores do not factor in admissions, but there is a lot of speculation. If I were aiming for Ivy admissions, I personally would not include scores of three, because the competition will not be doing that. Grades are still the most important factor, and they might not care that you didn’t self-report the scores. They know that not every student can take the exams, for a variety of reasons: cost, or a student was sick on the day of the test.
Having said that, are you a URM from a low-performing school district? Is there another situation, such as working to help support your family? If so, then I would report scores of three.