Talk to Gynecologist on Periods Late

aoa i m un married but har month maray periods one sa two week late atay hain koey proper date ni last month 17may ko ay thay or abhi tk ni ay hain doctor visit kar chuki but wo bol rahi koey masla ni asa hota hai last 7 months sa yahi ho raha hai weight bhi bilkul normal hai plz guide kar dain kya karo ka normal date par ayain