From the same source [all bolding mine]:
CONTRACEPTIVE USE
• Fifty-four percent of women who have abortions had used a contraceptive method (usually the condom or the pill) during the month they became pregnant. Among those women,
76% of pill users and 49% of condom users report having used their method inconsistently, while 13% of pill users and 14% of condom users report correct use.[8]
•
Forty-six percent of women who have abortions had not used a contraceptive method during the month they became pregnant. Of these women, 33% had perceived themselves to be at low risk for pregnancy, 32% had had concerns about contraceptive methods, 26% had had unexpected sex and 1% had been forced to have sex.[8]
• Eight percent of women who have abortions have never used a method of birth control; nonuse is greatest among those who are young, poor, black, Hispanic or less educated.[8]
•
About half of unintended pregnancies occur among the 11% of women who are at risk for unintended pregnancy but are not using contraceptives. Most of these women have practiced contraception in the past.[9,10]
Facts on Induced Abortion in the United States