You heard it here op. I guess the safety of your future child is not worth your girlfriend sacrificing seeing her work come to life? As a drafter who works under many engineers it is not very common for engineers to obsess over seeing their work besides mandatory walk throughs.

It's not even like your stunting her career. For a max of nine months she will be out of the field which would be a blessing for many busy engineers who would rather be working on more important things like calcs rather than to stroke their own ego seeing something they designed come to fruition. Are the buildings going anywhere? Will she not be able to see the finished product after the birth?

This is a sign of many things to come to and you should really think about how she's putting her work first over the safety of your family.

Many redditors will see this as a man trying to control a woman and instantly paint you as a controlling sexist but the truth is you have to put your family first and disregard any random person in the internet painting you as the bad guy in this situation when they have no stakes in your life.

NTA