I always wanted a son, though I love my daughter, I still crave for a son. Is this feeling normal to live with or will it affect my relationship with my daughter?

Its okay to miss a son but please do cherish what you have, your daughter. If this haunts you day and night and becomes a bias then it will definitely affect your relationship with your daughter. Love what you have instead of cribbing for what you don't have! You are blessed to be a mother, enjoy it!