I hope its nothing serious. What a stressful time it must be.
If you don't mind me asking is it the amniotic fluid that one bub has too much off and the other not enough or is it blood/nutrients from the placenta one is getting lots and the other not enough? There is a big difference between the two. Also are bubs identical or faternal?
Did you end up finding out what bubs are?
From what the other ladies have said it sounds like your in excellent hands and the fact your seeing them on Monday not today or tomorrow must be a good thing. If it was extremely serious I'd imagine they would want futher scans now not in the next few days.
TTTT is pretty common especially with ID twins although can affect faternal twins also. The amniotic fluid thing is not that common and many people wouldn't have alot of experience with this.
If you want me to write about the risks of bub having both not enough fluid and too much I can but will wait for you to reply first to make sure it is fluid we are talking about and not blood.