Talk to Gynecologist on Irregular Periods

Aslam o Alaikum doctors.Meri wife hy mera or uska nikkah engagement par ho gya tha or abhi rukasti nahi hui or Meri wife ki age 18 year hy toh usko period late aty hy or irregular period ka masla hy or period 1.5 month ya 2 month baad aty hy or jb 1 month hota hy toh har jaga pains hoti rehti hy or ham bht preshan hy toh mera sawal hy ky ap hamen kya advice kary gy or is problem kay liye kaun kaun sa lab test zruri kindly lab test zarur bata dy.Thanks a lot.