Just had an ultrasound at 6wks/2dys twin sacs very close together. i've a very tilted uterus. a yolk sac was seen in one but no fetal pole/hb. viable?

Twin sacs: You will need to have a few more scans over the coming weeks. It is possible that it was too early to see the fetus/heartbeat of both or either twin. Further scans will help see whether it is a miscarriage or not. It is not uncommon to see twin sacs early, but only one living baby later on. One twin can not develop ( it dies and is resorbed ) while the second twin does well with no problem at all.