Hi, My Periods Were Irregular. I Had Total 3-4 Cycles

Hi, My periods were irregular. I had total 3-4 cycles in last year. I did consult a doc and as me and my husband trying for a baby... he suggested me course of provera and climbed and asked to have contact between 13 to 18 days from first day of the period. we did. now my periods not come yet.I am already in 4th week passed my due, don't know wether to consider this 3 weeks as they are not regular. and HPT is negative ...I don't have any signs except little tingling in breast not often though...Dont know what to do...its killing wether i may or may not preg.