Is the coitus interruptus method and the ovulation cycle method effective in preventing pregnancy?

Atieno: Is the coitus interruptus method and the ovulation cycle method effective in preventing pregnancy?
Forget about condoms and contraceptive pills. How far are these two methods reliable?

Answers and Views:

Answer by Howdy Y’all
Not very effective. There is a name for people who rely on those methods… parents.

Answer by Cilla
From what I’ve read – if a man “pulls out” correctly every single time you have sex it is 80% effective. I’ve been doing a lot of research on this lately. The natural family planning method (again from what I’ve read) seems to be a very reliable approach. ONLY if you have regular cycles, you also must use an ovulation predictor and get your base temp around ovulation time, etc. There’s so much I have to learn, but I’m actually thinking of starting that method.

Extra information: I got pregnant on the pill and while using a condom. I have no faith in those methods anymore.

Answer by tcoJCoLDS member
the only sure method of avoiding pregnancy is abstinence