Irregular gestational sac

Patient: Hello, i am pregnant for 4 weeks. i visited my doctor yesterday she take a picture with ultrasonography. i added a link of my ultrasonography. http://s8.postimg.org/njstc8dlh/IMG_3810.jpgMy doctor said that: ” you have irregular gestational sac. and i couldnt see yolk sac.”Is ıt normal for 4 week pregnancy. Can you please help me?

Symptoms: Prengnancy

Doctor: