I need to know if this is common. I am 8 days late which I'm usually never late, but I'm testing negative. I have had symptoms such as pressure, pulling, and burning at my c section scar area. Extreme fatigue, nausea off and on, headaches, random cramping off and on that down lower than normal period cramps. If I go by the date of my last period I would be likely 4 weeks this week. If I am pregnant why isn't it showing up?