Me and my boyfriend use condoms at the moment because I have just changed pill and have to wait till after my next period to start it. However, my next period still hasn't come despite being due on a week ago. I'm freaking out because I'm never late and during one of our 'moments' the condok snapped but he changed it almost straight away. It's worrying me so much as I am only 17 and I'm just not ready to have a child. What are the chances I'm pregnant?