Is it possible that I am pregnant?

Obviously I can't know for sure but I can tell you of my experience. I did three tests before I I finally got a test to come back positive and by that time I was 7 and a half weeks. I have a friend that turned out to be preg but her initial blood tests from dr came back negative. They aren't always right but all you can really do is go back to the dr again. From the early days I remember soreness, veins being clearly visible along my chest and , frequent urination, nausea and bloating. There defiantly is the chance that you could be pregnant...