You don't have to imagine what it would be like if abortion rights in the U.S. were widely curtailed. All you have to do is look at the countries that currently have restrictive laws. What you will find is that abortion still happens. It's just secret and illegal, and more often than not, highly unsafe.
If we really want to improve women's health and reduce the abortion rate, we already know what works: invest in comprehensive sex education in school, ensure that women and girls have easy access to affordable birth control, expand access to health coverage for everyone, and protect access to quality abortion care.