urge need.

So, once again... Idk if I'm pregnant, I took a pregnancy test like 2 weeks ago, but my nipples are getting darker, I know it can happen when your about to start your period, but I have never noticed them this dark, and they do have little tiny bumps around like the actually nipple, well y'all know what I mean lol the "skin" part. Has anyone had this? Or do y'all think I am pregnant? What should I do?