Hi thanks for your question.
On 27th of November your ultrasound
showed small sized embryo inside your uterus
and rescan on 5th december showed no embryo but overain cyst
.In between two scan you had spotting.
well there can be two reasons for that.
Eigther you have aborted or one of two ultrasound report is wrong.
As for as overain cyst is concerned,It is of small size there is nothing to worry it will disappears of itself,but keep it under watch by repeated ultrasound if size increases, then you need consultation with gynaecologist to get it removed.
Hope this answers your question