pregnant or just freaking out?

Ok I've never done this or ever posted but I'm in need of help I'm 20 years old and my periods are usually on time maybe off by a half a day but I'm 5 days late and I have super bad anexity and I'm really nervous I mean I'd be happy if I was but it's the fact i dont know I took a cheap test (probably a mistake) but it was negative and that was when I was 2 days late so any advice??