What Is The Treatment For Irregular Menstruation?

hello mam

this is kiran from pakistan......i m 27 yrs old...single.....

i m having irregularities in menses cycle.....like i had my last menses started on 23rd Dec'10......n now its 4th Feb'11 n still i m nt hvng dat....plz tell me how long it can be delayed in normal...n also tell me any medicine or tips for the solution of ths problem...
thanx bye