According to LMP, your current gestational age
is more than 8 weeks but USG report shows 5-5.5 weeks. If you undergo the USG scan very recently, then fetal pole
or yolk sac
must be seen. But you have 2 weeks difference between actual gestational age (from LMP) and USG.
Here, I suggest you to repeat one TVS scan after one week from last scan date to get detailed picture. If you obtain same result, then it may turn into missed miscarriage
. Kindly, consult with your doctor. Good luck.