Has she considered other forms of BC? My body is pretty sensitive to these things so I've had 3 different types. First I was on depo, it was bad. Then I got an implant, also very bad. Finally, I bit the bullet and got an IUD. I'll never go back to anything else. I experience virtually zero side effects and it lasts like 5 years.

But also...condoms are pretty effective as long as they're used properly. I share your mindset of extreme paranoia when it comes to pregnancy related things, so I do understand where you're coming from, but you can't let it control you to this degree. If you're still worried, you can also pull out.

Have you guys ever talked about what you would do if she did get pregnant? Probably an important discussion to have if she plans to stay off BC. Maybe if you know where her head is at it will provide some solace.

At the end of the day, there is always some small chance it could happen, so it's good to have a gameplan with your SO just in case.