now i am 18+weeks of pregnancy.my ultrasound report is placenta:posterior, away from OS , grade 1 maturity.fetal heart rate: 133 b/m, fetal biometry : b.p.d : 45 mm , h.c :157 mm , f.l: 26 mm , a.c: 175 mm , fetal weight : 230 gm . composite age about : 18+ weeks size.is this report is normal?also last 2013 24th September I ve cesarean delivery for cause of complication of normal delivery.operation note was : primi e- 12 e- obstructed labor.