TTC late but brown spotting

Ok so I have taken 2 test. Both negative. But Im having some brown discharge it was like a lil red on 9/25. I was supposed to start my monthly on 9/25 so I used 1 test when I would be 3weeks that was negative this past monday I used another test still saying negative. My ? is how far along should someone be b4 testing? I have been sleeping almost 20 hours @ a time an I been eating everything in my path. my appetite is out the roof an i just cant stay awake an I have really bad headaches. these are all signs I think. been TTC for 4 years. Idk if its my diabetes or if im prego finely