I consumed birth control pill twice last month. Its been two weeks since I missed my periods.. my last period came on 29 sept 2013.. I got a negative result from the pregnancy test kit on d day I missed my period and a week later.. what could be wrong?

You need to wait two weeks before the test becomes really accurate. Less chance of a false negative.

Are you on regular birth control, daily pill, or is the the emergency contraceptive?