32.4% of rape survivors whose rape resulted in pregnancy did not discover they were pregnant until they had already entered the second trimester.

SOURCE | HOLMES, M M., ET AL. “RAPE-RELATED PREGNANCY: ESTIMATES AND DESCRIPTIVE CHARACTERISTICS FROM A NATIONAL SAMPLE OF WOMEN.” AMERICAN JOURNAL OF OBSTETRICS AND GYNECOLOGY, VOL. 175, NO. 2, 1996, PP. 320-4; DISCUSSION 324-5.