Yes, possible kasi na hindi sakto sa date LMP ang date of conception. Kaya mas ok na as soon as you find out na buntis ka, makapagpa-ultrasound ka agad para mas accurate ang age of gestation/date of conception/edd. As you go further along your pregnancy, nakabase na sa size ni baby yung nasa result ng ultrasound, which can be affected by many things like your diet, genetics, and other pregnancy conditions.
Andy