Girls. Here's how I understand it, according to the first ultrasound, …

Girls. Here's how I understand it, according to the first ultrasound, my due date is 34 weeks. But according to my cycle today it's 36 weeks. And what period should I give birth to? ? First pregnancy, I never had such a thing. We only looked at the cycles. Now it's unclear ? Today I went for an appointment and told him that it's 36 weeks, but the doctor only scheduled me for another appointment in two weeks because according to the ultrasound it's 34 ?