First of all, you need to undergo one home pregnancy test initially and blood test
for beta HCG to confirm or exclude pregnancy as condom has high failure rate (around 14% ).
In exclusion of pregnancy, reasons of delayed period are ovarian cyst
or PCOD (most common in your case), hormonal imbalance, stress/anxiety, thyroid problem, wt gain/ extreme loss, irregular eating habits etc.
Need to investigate properly to rule out underlying pathology by USG lower abdomen & complete hormone assay, thyroid profile, blood sugar & prolactin level, blood testosterone level
etc. Consult with your gynecologist for proper guidance and take suggestive measures.
Avoid stress/ tension, take healthy diet with Vitamin & iron supplements
, control body wt and take sound sleep. You may need to take hormonal therapy to regularize period with other supportive medication