It takes two to get pregnant, a sperm that has waggy tails and a limited egg, and with contraception, it has to do with preventing these two from coming together. Sperms are in excess when ejaculated 200 to 300 million sperm cells, so how do we prevent these good swimmers from reaching an egg?
One common method is the withdrawal method also known as the withdrawal and pray method. This is known as this because the man has to withdraw very fast before the main ejaculation and hope that he ejaculates outside the vagina. After this, he needs to start praying that there was no pre-ejaculation because with that, the egg could get some visitors willing to fertilize it.
Another method is the calendar method where the lady is aware of her fertility period. With this method, the woman calculates her temperature, looks at her cervical mucus, and her menstrual cycle. She learns and studies her fertile window, and she does everything to prevent sex at that time or at least uses a condom if she is going to have sex.
For safety, the barrier method is a great companion. For goodness' sake, using a condom can save you from a whole lot. The job of a condom is to trap sperm from getting into the female's body, and this can be done either by the external type which is worn by males, or the internal type which is worn by females. This is very cheap and it is very effective against pregnancy and Sexually Transmitted infections (STIs).
If used correctly, then you can be safe up to 90% for the external condoms worn by males. This is according to the World Health Organization (WHO) and about 95% for female condoms which is the internal type of condom.
Instead of thinking and praying about your sex life and hoping that you don't get pregnant, you could just use a condom. For heaven's sake, this is very effective against STIs which can be very painful, embarrassing, and emotionally draining while at the same time saving you from the emotional drain of thinking if you are going to have a child or not.
Reference
https://www.webmd.com/sex/birth-control/pull-out-withdrawal https://my.clevelandclinic.org/health/articles/24174-pull-out-method https://www.mayoclinic.org/tests-procedures/withdrawal-method/about/pac https://www.nhs.uk/contraception/methods-of-contraception/internal-condoms/ https://www.plannedparenthood.org/learn/birth-control/internal-condom https://www.cdc.gov/condom-use/resources/internal.html