The gestational sac
is often the first thing that most transvaginal ultrasounds can detect at about 5 weeks. This is seen before a recognizable embryo can be seen. At about week 5 ½ to the beginning of the 6th week, a yolk sac can be seen inside the gestational sac. The yolk sac will be the earliest source of nutrients for the developing fetus.
Your scan report shows that a pregnancy
sac and a yolk sac is seen , which is a good sign at 5 wks gestation. Fetal pole
is usually not seen at this gestational age
.Poor decidualization indicates less support to pregnancy, but alone does not predict the pregnancy outcome. I would suggest for a repeat scan after 1 week to look for fetal pole and fetal growth. I would suggest you to meet your gynecologist and to consider progesterone
support for pregnancy.
Hope i have answered your question.