Answer: After the egg fertilises, it travels down your fallopian tube, and gets embedded in you uterus (womb). At exactly this place where the fertilised egg implants in your uterus, your placenta gets formed. Thus, the position where placenta implants and develops may vary from person to person. Fundal position, in which the placenta lies on the top wall of your uterus. Grade 2 – (marginal) the placenta reaches the cervix, but doesn't cover it.Grade 3 – (major) the placenta partially covers the cervix.