Hi, Doctor my wife is today 15 weeks 1 day pregnant. Today ultrasound informs Placenta is posterior and reaching upto the os. Retroplacental area is clear. FHR: 151BPM, CRL =8.5 CM=14.3 WEEKS, FEMUR LENGTH = 1.5CM=14.3 WEEKS, INTERNAL OS IS CLOSED, LENGTH OF CERVIX= 3.3CM, BPD=1.5CM=15.4 WEEKS, AMNIOTIC FLUID IS SUFFICIENT AND IS UNIFORMERLY DISTRIBUTED. Doctor, posterior placenta raching to os , what is the meaning of it, is it serious, what precautions my wife should take as she stays alone at home while i go to office. Mahendra kashyap