Hello everyone. Today's ultrasound showed a 4-chamber heart biopsy wit…

Hello everyone. Today's ultrasound showed a 4-chamber heart biopsy with no clear visualization of the interatrial septum in the muscular part at a distance of 1.2 mm. What does this mean? The sonographer didn't fully explain it and also said she is behind development by two weeks according to her monthly calculations. On early scans they said the due date is September 11th, on the first scan they said the due date is September 9th, now she says the due date is September 12th. Should I be worried about this? Is this a heart defect or something? ?