I am 8 wks pregnant.vaginal bleeding( spottin) for two days.u/s results show that i have empty yolk sac.is this a miscarriage or any chance of baby?

Possible pregnancy: I think that you mean that the U/S should an empty uterine sac. Most probably this is what is called a blighted ovum, meaning that there is no fetal development.

Miscarriage?: Sadly, it sounds as though U may have miscarried, based on the empty egg sac and 2 days' bleeding. Best to consult with your OB doc to confirm or deny. If confirmed, OB will need to remove retained tissue to prevent future complications (D&C).