sir iam 19years.this is first pregnency.scaning details fetal heart rate147bpmregular. BPD-41mm, OFD-51mm, HC-147mm, AC-118mm, FL-25mm, HL-25mm, UL-24mm, TL-22mm, FOL-27mm, cerebellum -16mm, fetal weoght-210gr, fetal bio metry-18weeks. placenta is anterior,upper segment, grsde I maturity. liquor is adequate. cervical length is 28mm . internal OS is closed,