pregnancy due date

hi gud pm po s laht dto☺naguguluhan po kac aq ung medwife n lyin in n aanakan q ngbase cla s first ultrasound nung feb 29,, DD q dun sept 24 pero ung ultrasound q s aug 14 sept 29 at kung kwentahn d LMP DD q sept 30 alin po ang dapat sundin? thank s po advance s mga sasagot☺