I have teaken 4 tests and am 4 days late for my ...

I would breath and try to look at the situation in a logical manner. I have had  a few pregnancy scares (and so have a few of my closest friends). It is possible that your period is late due to stress or sickness (you may have the flu or a virus). Believe it or not, 4 days is not THAT bad. Those tests are really made for women who are more then a week late, so 3 more days to go then take the test again. Breath and try not to stress out too much (that can make your period come even later).