This article from 2005 quantifies several dozen reasons why women choose abortion. I selected the following, which seem to fit the claim:
From Table 2. Percentage of women reporting that specified
reasons contributed to their decision to have an abortion.
Figures for 2004; N = 1,160 (selected)
Can't leave job to take care of a baby 21%
Not enough support from husband or father 14%
Not sure about relationship 19%
Relationship or marriage may break up soon 11%
Husband or partner is abusive to me or my children 2%
Don't want other people to know I had sex or got pregnant 25%
Husband or partner wants me to have an abortion 14%
Parents want me to have an abortion 6%
Was a victim of rape 1%
Note that the answers are not mutually exclusive; the sum of the entire table is 744%, so each survey respondent selected (on average) 7 reasons.
Finer, Frohwitrth, Dauphinee, Singh, and Moore, Reasons US women have abortions: Qualitative and qualitative perspectives (2005), Perspectives on Sexual and Reproductive Health, 38(2), 90-95.
Also summarized by the American Psychological Association Task Force on Mental Health and Abortion (2008), page 80