Talk to Gynecologist on Lmp Date

assalam o alikum respected doctors, yeh Meri sister ki trf s post h or wo kehna chahti hn k unki LMP 29 January 2023 thi mgr ghalati s UNki reports pr or ultrasounds pr (ab tk unk 3 ultrasound ho chukey Hain, last scan anomaly scan tha or report bohat achi I hai) LMP 31 January 2023 likh di gaei h. ab wo pareshan hn k EDD m koi problem tu nhi aaygi or wo apni doctor ko yeh mistake btate hue bhi darr rhi hn.. wo thori pareshan hn is wja s... I want to ask k waqaei is s bohat bara difference lg skta h EDD m ???