Help please !

Michelea

Just had 1st ultrasound and my by last period I should be 9w1d. The ultrasound should just a gestational sac and nothing in it but measuring 5w5d. I’m waiting to see the doctor now. I do have irregular periods but I don’t know how it could be off this much. Any success stories or advice is appreciated. Thanks. Edited to note I’ve had no symptoms of a miscarriage and just sore breast tired all the time. And have to pee a lot.