My period was supposed to come on oct. 27 but I took 2 pregnancy test on thursday and they were both negative should I worry I don't know if I should be worried, if I am pregnant but its negative when I took the 2 test

If . If you still do not have your period, then you should take another test. The pregnancy hormone (beta hcg) builds up slowly, so it may have been negative initially then positive now if you still haven't gotten your period.