Suggest Remedy For Delayed Period

hello Doctor.I am trying to conceive. my period comes every month but date is not fixed. sometimes it get delayed by 28 to 30 to 32 days. my period due date was 11th dec 2011 but it got delayed by 8 days. i took two prega test which showed negative. on 9th day i got 2 drop of brown discharge and 4 drop for next 5 days. then i went to the doctor who prescribed me Orgamed. i took for next 7 days but till now didnt get my period. i am worried. don't know what to do. pls suggest.