The best way to request a fast safe, reliable, and affordable Prenatal DNA testing options within minutes. Use natus on your phone to connect to a agent on any major City from your phone tablet or laptop. http://natus.co/
Even MaterniT21 says "no test is prefect" and that "Cell-free DNA (cfDNA) testing does not replace the accuracy and precision of prenatal diagnosis with CVS or amniocentesis." It doesn't test for neural tube effects either.
Natural Family Planning (NOT to get pregnant, lol) Fertility Awareness: Natural Family Planning (NFP) "Fertility awareness or Natural Family Planning is a method of birth control that does not use any drugs or devices. It combines the calendar/rhythm method, the basal body temperature method, and the cervical mucus method."