late period negative test

I'm currently 16 dpo and the last time I tested was Sunday it came out negative. My period was due Saturday. I have a lot of green veins all over my breast I feel very ashamed because I feel like they look ugly. They hurt usually on the sides but for the past couple days they have been hurting underneath my boobs. I have been having light cramping but I feel like my period is not coming. Has anyone had this happen? Anyone knows what's going on with me? Is there a possibly that I'm pregnant? SOMEONE HELP ME ☹️