The pill and BMI over thirty

I have read that women with a BMI of thirty or higher are more at risk for unintended pregnancy when taking the combined pill. For women with this BMI are you on the pill, and do you trust it? I’m currently right at a BMI of thirty and am trying to lose weight as we speak. What is everyone’s opinions. I take it perfectly, but I’ve read that in some of these studies were obese women were on the pill, they didnt know for sure if the pill was taken perfectly or not...