This is one of the reasons that I try to emphasize to ideologues of all stripes that if you go looking for evidence that backs your position, you will find evidence that backs your position, and you will miss the evidence that doesn't.
UPDATE: Here is a really harrowing paper that may shed some light on the Hungarian study to which I previously referred: Mladen Lončar, Vesna Medved, Nikolina Jovanović, Ljubomir Hotujac, "Psychological Consequences of Rape on Women in 1991-1995 War in Croatia and Bosnia and Herzegovina," Croatian Medical Journal 47:67-75 (2008). Of their sample of 68 women who were raped, 42.9% became pregnant, although many were subject to repeated daily rapes and gang rapes, hence the very high rate of pregnancy.
Almost half of women got pregnant as a result of rape. Women who were raped once, compared with those repeatedly raped, had seven times higher risk of pregnancy.The paper also mentions that many of the women were tortured, forced to watch family members killed, and watch other women raped. This might explain why the women raped once were subject to so much higher pregnancy risk than the ones who were repeated victims. The repeated victims were apparently subject to much more traumatic situations.