I'm 3 days late

I'm 3 days late with negative pregnancy tests. I have a very regular period but have not experienced even any signs of it coming. I've been extreamly tired eating a lot more than usual urinating a lot. Like I go to the bathroom before I lay down for bed and within 5 minutes I have to go again. I'm not sure if it's just too early to tell or if something is wrong. I don't know what to do!