I am in London and my flight to Seoul is on 26 March to visit you for rhinoplasty and I will leave Seoul on 7 March.  My menstrual period is supposed to come on 13 March, but it has not come yet.  I am not pregnant and the delay might be due to stressful study.

I am not sure when my period will come, but I don't want to cancel my scheduled trip.  Could you please give me some advice on what I should do so that I can smoothly and safely proceed to the rhinoplasty?

Many thanks for your help and I look forward to your reply.