Help!! Are these pregnancy symptoms?

I have a cycle ranging between 32-38 days. Post ovulation I began having lower backaches. The pain would sometimes radiate to my hips. Cycle day 24 I began having ocassional abdominal twinges.  Cycle day 27 I took a HPT and got a BFN. Today is cycle day 29 and I woke up with cramps and slighty loose stools (sorry TMI). This afternoon the cramps subsided but my back pain is still VERY present. I have also had headaches, dizziness and nausea a little throughout the day. Do these things sound like pregnancy symptoms? 

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