I don't believe you could still be pregnant after taking multiple home pregnancy and blood tests, all of which were negative. Sometimes when a woman is impatiently awaiting her period, the anxiety and stress can cause you to be even more late. If you have already visited your doctor and he told you that you aren't pregnant, I would try to relax and not think about an impending pregnancy. Remember: "A watched pot never boils." If you skip your period entirely, I would visit the doctor to make sure no other abnormalities are causing your missed periods.