oh i found it, it is bathhouse near crystal teleport but need Ruk and Succu in team to trigger eventRight, that makes sense, otherwise pregnant Club scene couldn't be. So, as I understand, you need to liberate Summeredge (and maybe visit the Club) for ALL FemPregnancies to happen!
Liberate Summeredge first (and maybe visit the Club).
Don't remember amber waterfall. One warehouse is in poor district east from entrance, there is an entrance to the alley.