No means of prescribed or purchased contraception has a 100% success rate.
Some suggestions are about as effective as fairy dust from tinkerbell's wings, particularly pull out and natural contraception apps.
Most conception involves either hormones or other chemicals that come with a risk of side effects including: pain, weight gain, nausea, increased blood pressure, skin blemishes, pelvic infection, displacement, ectopic pregnancy or womb damage.
Can also be indicative of a form of government that favours excessive state intervention into the private lives of law abiding adult citizens.
Risk of totalitarianism and ethical problems.