Almost 99% of abortions take place before the 20-week mark, so in the end, this doesn't really do anything anyway. In Ohio in 2015, just 145 of the 20,976 abortions took place after that 20-week mark, which is 0.007% of the abortions in the state. Most of the time when abortions happen after 20 weeks, it's because of a major birth defect or something related to the health of the mother.
Also, abortion has trended down fairly significantly during the Obama administration, and this is partly due to more women having easier access to birth control. If you don't like abortion, then you should definitely be pro-birth control since that's the best way to prevent unplanned pregnancies. We live in a country where 95%+ of all Americans have sex before marriage, and abstinence-only education has proven to lead to higher pregnancy and STD rates.