I've recently started taking Cerelle (2 days ago) and I'm confused. My GP said when she prescribed it that if I started it on days 1-5 of my cycle I would be protected right away, any other day and it would be two days before I was protected. However the instructions that came with the pill only say instant protection if you start on day 1 of your cycle, otherwise it's a week before you are protected! I started it on day 5 but I'm wondering how cautious I need to be for the next week!