kariva drug interaction with OTC pain killers

I'm going to start taking Kariva this Sunday. Before I was taking a different birth control. I want to know why you should avoid tylenol, advil, aspirin, and ib profin. I ussually have headachs on occasion.....what are the risks if any if I would take Tylenol 4-5 times a week while taking Kariva?

thanks,

angela