Am about 38wks at end... went for the check up and my doctor said that the baby"s head is above which should come low before 20 days and my due date is on 23rd of this mth... What should I do too let my baby head down and to have normal labour? Thanks in Advance for your reply...

You just have to let nature take its course.
You can't affect any change and you need to trust that the gift that you have been given will continue :)