March 28th period started and again may 9th came periods.usually periods before 1week my breasts will be tender n heavy n backpain will be there.this time no heaviness n pain but have backpain n lower abdomen hurts and sometimes sharp pains on n off near left hipbone.brown spotting like thread and very little amount of drops ..it was not like my usual period.my period will continue only 3days.but this time is it spotting or my periods came i dont know? I have taken hcg test 4days back,negative