Not all methods are created equal. The most effective methods are long-acting reversible methods like IUDs and implants and permanent methods like tubal ligation, Essure and vasectomy. Less than one out of every 100 women who use these methods will become pregnant within the first year of use.
Hormonal methods like the pill are very effective if they are used correctly. Up to 8 out of every 100 women who use the pill will become pregnant during the first year of use.
IUDs and implants are generally considered to be the most effective methods, both because of the ways they work in the body and because they are so easy and convenient for women to use. These methods also work for a long time before needing to be removed or replaced, so it provides women with protection without any gaps. Women who take pills often have trouble getting their prescriptions for pills refilled, especially if they move to a new community or have changes in their income. The more responsible you are in using the method correctly the more effective it will be.