唔算係小產, no need to 坐月, 當M黎. but see a 中醫調理下!
i think it's called "Blighted Ovum": A fertilized egg implants into the uterine wall, but fetal development never begins. Often there is a gestational sac with or without a yolk sac, but there is an absence of fetal growth.
A blighted ovum can occur very early in pregnancy, before most women even know that they are pregnant.