When you're deciding what form of birth control to use, it's important to go over all of your options. When comparing, you may want to consider how effective one form will be over extended periods of time.
Gregor Aisch and Bill Marsh at The New York Times did some investigating into how likely it is your birth control method will fail. When the research was completed, they were left with 15 interactive graphs for you to use for your own research. Each graph has a line for the number of unplanned pregnancies out of 100 women when that particular method of birth control is used perfectly, but there is also a line for what's considered typical use. Aisch and Marsh explain:
The longer any method of contraception is used, the greater the probability of unplanned pregnancy — the same way that any small risk, taken repeatedly, grows in likelihood. This is true for all contraception methods, even in the highly unlikely event that they are used perfectly, every time.
If you'd like to check out the interactive graphs and see which methods might be best for you or your partner, head to the link below.
How Likely Is It That Birth Control Could Let You Down? [The New York Times]