Because you didn't read it, you missed the part about abortion..........I'll put it in quotes for you here....

"Others described how the fighters so opposed pregnancy that some tried to force young women to abort.

Abdal Ali said his sister, 20, was in her second trimester at the time of her capture in 2014. Still, one commander so urgently wanted her as his slave that he tried to end the pregnancy by giving her pills that would cause her to miscarry.

“She hid them under her tongue, and then when they weren’t looking, she spit them out,” said Mr. Ali, who related the story on behalf of his sister because she is undergoing medical treatment abroad for the injuries she suffered. “They wanted to get rid of the child so that they could use the woman.”"

Here's another source....
http://www.cnn.com/2015/10/06/middleeast/pregnant-yazidis-forced-abortions-isis/