am i pregnant?? brown spotting nw light?

hi
this is vany. i am 30 years old. i am trying to be pregnant since 2009. my period is irregular. i talked with doctor and he adviced to take me clomid. then i didn't get any chance to pregnant. now i get 31 day cycle to get period.
i got my last period jan 09/11. this month i got 10th light brown spot and then 11th i got dark brown little bit more then stop. now i get light spotting. am i pregnant??? is it symbtom for pregnant?/ please help me for this! thank you so much