Considering they already do that just to avoid rear echelon deployments, probably quite a few. Commanders will attempt to implement policies to prevent them losing soldiers downrange from pregnancies, and will be attacked by the media.
The women pushing for it are commie-lesbos who are devoid of common sense.
They also don't care how a policy they have endorsed will effect future women who will actually have to go and fight on the front line.
Unlike themselves who will spend the war in their air-conditioned offices stateside.