usually first scan should be done around 11-13 weeks. So, if your time permits, you can wait for your doctor to come provided there is no other emergency arises.

Hello...... If you had already done first scan ..this scan is to know the growth of fetus and NT scan is done around 11 to 12 weeks of pregnancy ...get scan done in any diagnostic.. If she is going to be late consult other gynecologist with all your old reports.. Otherwise they may ask you to repeat all those tests.