Yes - we did 2 frozen. One Split so we are pregnant with 3. We are 12 weeks and the DR is worried the identical split because they have chromosomal problems. One identical is measuring perfect but the other has a swollen neck area. We have been advised to have the Amnio week 16 - has anyone else had the same problem? I do no not like DR's telling me we have a 60% chance of Downs - and they simply can't explain why baby C is measuring fine.