I am a 28yr old and have been on BC for about 12 years. My periods are very regular almost down to the minute. Well this month I haven't got it. I am now 6 days late and am supposed to start my BC again tomorrow. I have taken 2 pregnancy tests and they have come back negative. I know stress,diet,exercise etc can affect your cycle but I haven't changed anything. Is it possible I could be pregnant and it's just to early for the test to pick it up or what????? HELP?????