Possible to be pregnant with BFN?

Hi everyone, I am on cycle day 44. Normally I get my period between cycle days 31-35. I have no signs of AF except cramping for about a week and a half now. I am feeling "tinges" in my lower abdomen, my upper thighs feel sore, my breasts slightly larger. Have had some headaches, insomnia, increased appetite, slight nausea from time to time (almost like indigestion), and some irratibility. The thing that's driving me crazy, is I have taken 6 tests; all saying negative. Is it possible that I am still pregnant or could AF just be this late? I am normally RIGHT on time.  I'm very frustrated and would just like a BFP or AF at this point, since I'm not feeling well.