I should hane my period at 15/3,but until 17/3 still didny come,will I pregnant?

The OP is saying 'I should have my period on March 15, but it is now the 17th and it still did not come. Am I pregnant'

I think this is a language barrier :) it took me moment to figure it out

OP, it is very common for periods to be late by even a week or 2 after intercourse. I am not absolutely sure WHY, but having sex, taking a bath, going swimming, being stressed out, being ill, all can make your period late.

If you still have not had a period by next month, then its time to take a test, and see your doctor.