Hello Dr .. M 23yr Old .. I Always Had

Hello Dr .. M 23yr old .. I always had my periods on time or before 2-3days of previous date.. but it's first time . It's 8days and I didn't gt yet.. I m an orthopedic patient nd I'm taking medicine continuously since one year.. next week I have to get admit in hospital for my next surgery .. plz suggest me to get periods today or tomorrow .. it's very urgent.. thnq ...
If possible plz give reply as soon as possible