My wife is doing it with nothing more than an app for 6 years while using some hormone kit before. I'm quite surprised how well this works but we are in a stab

My wife is doing it with nothing more than an app for 6 years while using some hormone kit before. I'm quite surprised how well this works but we are in a stable relationship. With or without plan b it would not be the end of our life's if we would suddenly getting a child. Not sure how I would see it if I would be 20 and not above 30