Question about pregnancy tests!!

Alex
So i took a pregnancy test yesterday morning and it was negative. But period was supposed to be due today but it did not come... So my question is that if I tested the day before my period and got a negative, does that automatically mean I'm out? I tested with the first response that's suppose to be able to detect pregnancy up to 6 days before... But I'm just wondering if I could maybe actually be pregnant or if I'm automatically out because of the result of the test of the day before period? Just wondering if I should go out and by another pregnancy test or not....