Very newly pregnant (after 6 months of trying!). My plastic retainer for my teeth broke, and I just got a new one. Even decades after braces, my teeth shift fast. The ortho made a slight adjunstment and says I should wear the new one for 3 weeks straight (I had planned just to wear it two nights a week). I am 4 weeks tomorrow - so really crucial development and worry about the leeching chemicals and phyto-estrogens. During pregnancy #1, I wore them every night without thinking, and my son does have a small deformity that one doctor told me is now epidemic because, he believes, people are drinking water from plastic bottles and so getting hormonal imbalances from the phyto-estrogens. I avoided all plastic bottles and plastic containers during my first pregnancy (and yet put the retainers in every night without thinking).