They used to be oriented vertically. That is, one was on top of the other. But now, it seems that they've shifted and they're now laterally right next to each other. I've noticed this last night when I saw that my wife's belly suddenly seemed wider and more boxed shape.
Also, the part of the placenta that was detached was the uterus wall is now fully healed and firmly attached! Yay!
One of the twins appear to be larger than the other. But the difference is within normal range, so there's nothing to worry about. Each baby has roughly the same amount of amniotic fluid in their sac, so that's reassuring.