am I pregnant?

Trina
Ok I have a question for all you women out there! I am not actively TTC but we haven't done anything to stop it... on to the actual question lol... I was supposed to start 3/6/17 and only started this morning 3/13/17 so a week late but it is sooo light, way less bleeding then normal for me and this is along with major back pain, monster headaches and serious fatigue that have plagued me all week. I thought I was pregnant till I saw blood this morning but now seeing it so light and feeling nausea which is also not normal Aunt Flow symptoms I dont know. What do you all think is there still a chance?
K I sucked it up and took a test but no line that I can see. What do you guys think?