200 servicewomen have left afghanistan. after learning they were pregnant. >> you can go home if you are pregnant. >> she didn't know. >> this was not a publicity stunt because she would have taken the first plane ride out of there. unbelievable. the woman. this is great. imagine this. pregnant the whole time. included training, 8-mile march and 5-mile run. pregnant. not knowing it. tough lady. >> i don't know. the discovery channel, i'm pregnant, dot, dot, dot. i'm pregnant and didn't know it. the woman, same situation. got sick. took a pregnancy test. came back negative. lost weight. tll were pictures of her six months' pregnant. she could not tell she was pregnant. she maintained her period. she had no idea. she literally gave birth in a bathtub. what is it coming out of me? a chide. it has happened. >> guess it happens. >> i was huge, no denying i was pregnant. katy perry at the top of the pop music charts. it isn't enough. >> how the singer is looking for more in her life and finding it. you are watching "world news now."