You can place one leg on the toilet closet, insert two fingers by joining them together to create a shart edge with your nails.
Then insert your two fingers into the vagina and try to take it out the stuck condom using your nails. You can feel the condom and pull it out gently. You can push it down with your lower bowel movement and ensure the condom comes down and becomes reachable with your fingers. This is an easy way to remove the stuck condom from your vagina.