Pregnant?

Last menstral was on June 30. On aug 1 I had very little spotting so I thought it was the beginning on my period.  Then day after there was still very little spotting, so little not enough to need a pad. That lasted for about 4 days. Day after the spotting ended I Started feeling very crampy.  Nothing I can't stand but just know it's there. Up to this day August 12 still feeling it with back pains and clear discharge. With very mild breast pain. And nauseated at times.  But I took 3 preg test and all came out neg.  I am so confused and anxious.  I called my dr and he's not in the office til end of next month??!!! Someone help!