Talk to Gynecologist on Periods Problem

assalam o alaikum..meri age 27 saal hain 6 years hogae hai meri shadi ko 2 bache hai bara beta 5 years ka or chota beta 2 years hain...wese to periods problem mjhe kbi ni hui hmesha date se 5 days pehle hojate the..pr pichly month mjhe date se 7 days pehle hue..or is month mjhe 10 october ko hone the jo k ni hue..me ne aj pregnancy test bhi kia jo k negative aya hain..life mein aesa kbi ni hua k meri date kbi agy gai hon hmesha pechy atin hain...kia problem hosakhti hain..mjhe bht dar lgta hai k kahin mjhe PCOS to ni hogya.. please btae k aesa kio horha hai kch din wait krun periods hone ka??