According to lmp on may 28 it is 10 week 4 day ,but based on scan it's only 7 week 2 day.and lmp based due on December 21 and ultrasounds base due on January 13.on second scan taken at july 3 rd. On lmp base it is 15 week 4 day but scan base it only 12 week 2 day and lmp based delivery date on December 21 and ultrasounds base January 13.then can u pls help when did actually get pregnant. Because based on lmp and ultrasounds 3 week 2 day difference is coming in both scans.and due date are also different. When did actually get pregnant pls help