^ none of them is pregnant. the actual pregnant one is already on hiatus. the one you are thinking of is gonna go on hiatus in April to "prepare for a pregnancy". she lost a child before?
^^ just let me be a bit more clear to avoid any further confusion. Tomoko (村上知子) announced her pregnancy back last year and is on complete hiatus/maternity leave since last month since she's gonna give birth soon. She doesn't partake in this whole MoriMusume thing.
Ooshima (大島美幸) is the one with the short hair cut and seems to have a bad history with her fertility to begin with. From interviews of her husband it seems she's going on hiatus in May (not April).
This song is awesome. but really Morisanchuu's lines make it it even more so. I wonder how the MM14 only ver. is going to sound like. would be nice, it they had someone like Zukki do some of the lines in a comical way.