The alan guttmacher institute is trusted by many people, and an authority on sexual health.
Http://www.Agi-usa.Org/sections/abortion.P hp

incidence of abortion
49% of pregnancies among american women are unintended; 1/2 of these are terminated by abortion.[1] 24% of all pregnancies (excluding miscarriages) end in abortion.[2]

in 2002, 1.29 million abortions took place, down from an estimated 1.36 million in 1996. From 1973 through 2002, more than 42 million legal abortions occurred.[3]

each year, 2 out of every 100 women aged 15-44 have an abortion; 48% of them have had at least one previous abortion.[4]

contraceptive use
54% of women having abortions used a contraceptive method during the month they became pregnant. 76% of pill users and 49% of condom users reported using the methods inconsistently, while 13% of pill users and 14% of condom users reported correct use.[11]

8% of women having abortions have never used a method of birth control; nonuse is greatest among those who are young, poor, black, hispanic or poorly educated.[12]

49% of the 6.3 million pregnancies that occur each year are unplanned;[13] 47% of these occur among the 7% of women at risk of unintended pregnancy who do not practice contraception.[14]

as much as 43% of the decline in abortion between 1994 and 2000 can be attributed to the use of emergency contraception.[15]
there is no evidence of childbearing problems among women who have had a vacuum aspiration abortion, the most common procedure, within the first 12 weeks of pregnancy.[24]

the risk of death associated with abortion increases with the length of pregnancy, from 1 death for every one million abortions at 8 or fewer weeks to 1 per 29,000 at 16-20 weeks and 1 per 11,000 at 21 or more weeks.[25]

the risk of death associated with childbirth is about 11 times as high as that associated with abortion.[26]

88% of all abortions are performed in the first 12 weeks.