How lovely to see the precious scans photos and hear everyone's good news.
HchyScott it's benzoyl peroxide and salicylic acid that are supposed to be used with caution in pregnancy. Basically there's not enough research into whether they are safe or not, so people tend to avoid them just in case. This particularly applies to masks and creams, which stay on longer, if it's just face wash most online sources say it doesn't matter because the skin contact is so minimal.
I also feel horrid and covering it all up in make up doesn't do it any good, but I still do it.
Oddly, I do have fairly chronic stress eczema on my neck, which was completely gone away since I got pregnant.