Blighted ovum

Ilang days magstay yung blighted ovum? Pinainom na ko ng gamot and suppositories. Wala parin nangyayari. I asked my doctor if still safe paba magstay yung yung sac in my body, and she can’t answer my questions. PS: I want to change my ob, for raspa procedure. Any thoughts? Naguguluhan lang ako mga mi since I find off kasi sa ob ko ngayon.