Hello. My first day of my last period was August 10th, 2020. Today is the…

Hello. My first day of my last period was August 10th, 2020. Today is the fifth day of delay and the test showed two lines. I went for an ultrasound, they said it's two weeks. On the calendar it shows five weeks, but on the ultrasound it says two weeks. Is this normal? Please tell me.