Johnstons Archive - Abortion Reasons
Compiled results (from the states they could obtain data from) indicate the following;
Also note, these are federally funded abortions, not private pay.
REASONS FOR ABORTIONS: COMPILED ESTIMATES
physical life of mother--(0.1-0.3 %)
physical health of mother--(0.1-3 %)
fetal health--(0.1-1.0 %)
too young/immature/not ready for responsibility--(32 %)
to avoid adjusting life--(16 %)
mother single or in poor relationship--(12-13 %)
enough children already--(4-8 %)
sex selection--(<0.1 %)
Marital status is not indicated in any of their statistics (which are pulled from various health departments), so I wouldn't blindly assume that enough children already and economic reasons indicate the women are definitely married with children.
Also worth noting, the rape\incest argument appears to be a fallacy, based on these numbers.