I would classify my first pregnancy as easy (if HG is ever easy) compared to my 2nd pregnancy. Regardless, I have been told by my daughter's dentist that the discolored yellow spots on her bottom adult teeth happened while I was pregnant with her. The teeth are not rotten or have cavities. It is just a discoloration of the enamel.
He asked if I was sick at all with her - ha! I briefly explained my plight and he said that explained it.
Thankfully, her teeth can be capped when she is older, covering the yellow spots.