The new pill and the breast

I have mixed feelings about such findings regarding the new pill and breast cancer. By all means, if there is a drug to reduce the risk of breast cancer- then I tend to be for it, as a woman. However, I'm always hesitant of new drugs and new research. Inevitably at some point there's research that rebuts the initial findings and by that time, people have been taking the particular drug and adverse side effects are a reality. Consequently, I will not be signing up to take the new pill, regardless of it's potential positive effects. Cancer appears to be quite random as disease goes. I could take this pill and never get breast cancer, but do I assume it's because I used this 'preventative pill' or, is it because I've been healthy and it just wasn't 'in the cards' for me? How does a woman know it's the pill or health? Or, if one was to get breast cancer and had been taking this pill, what then? Medical promises can be misleading, and research can be wrong. I prefer other birth control methods, particularly ones that don't mess with my systems.