What Is The Fetal Viability Due To Damaged Tube And History Of Ectopic Pregnancy?

hi My daughter has just had an ultrasound 5weeks 2 days, just showing gestational sac, no yoke sac, last year she had entopic pregnancy, resulting in loosing her tube, her other tube is badly damaged, and bent from a previous entopic pregnancy, 10 years ago, she was told only 1 per cent chance of natural pregnancy, was advised of IVF, what are her chances of this being a viable pregnancy, could it be a blighted ovum