I recently had an u/s at 5 weeks 3 days. Dr. detected 2 sacs, one had a yolk and embryo one was empty. Then a 3rd appeared which was either an empty sac or a bleed. I go next week for another u/s . Wondering what the chances are of the twin having a yol at 6 wk or staying empty. Also wondering what the bleed is or if it is in fact a 3rd empty sac. Will this harm my one good baby right now. Help???