What Causes Delay In Periods After Finishing Pack Of Contraceptives?

hi I am 42 yr old I diagnosed that i have poly cystic ovary...i took contraceptives pills and I have period last Dec24-dec28 I started again new packs of 28pills contraceptives dec25...my problem is why I don't have period till now i finish my pills last Jan25 now is feb8....I took pregnancy test three times and it is negatives...What will I do? thanks a lot