I had sex with my boyfriend the other week and we used protection like always. We always check each and every time that it's on properly, not ripped beforehand and always check after if it's broken and it never is. My period was due 28/12/12 and it's now 5/1/13 and all I've had is slight nausea and the odd cramp/pain like I would get when my period starts, but not as bad. Both myself and my boyfriend are worried as I was supposed to be starting the combined pill when I started my period. Could it be stress or is it possible for me to be pregnant? Help :(