Periods suppose to come on 2/5 bt on 30/4.i had unsafe sex.took ipill on 1/5.on 3/5 bleeding start . periods?

they are my periods or just a side effect of i pill.. on 2 may after takin ipill .. brown discharge,,, was also started... in very less amount... and on 3rd ... bleeding start... bt less than my... normal periods.. so i m confuse... because my periods are also suppose to come ... on that tym,... so plz... telll me what is this... i m pregnant..?? or it is normal...???? plzzz tell me... i pill is working... or not..?