A p2 +1 female comes with amenorrhea of 5 weeks. Her UPT is +ve. On USG, Gestational and yolk sac are seen in uterus. No fetal pole is visible.No fatal cardiac activity is seen. CRl is 8mm and MSD= 28 mm. What is the next best step?

In a normal ble pregnancy gestational sac appears at 4.5 weeks,yolk sac at 5 week,fetal node at 5.5 week,fetal hea at 6 week.In this case fetal pole and fetal cardiac activity cannot be detected even at 5 th week.So it suugests high probability of non ble pregnancy and sholud wait for 7 days and repeat the USG. For more details ,refer page no 475 of text book of obsteics,sheila balakrishnan,2 nd edition.