Pregnancy is a symbiotic relationship between the mother and fetus. The fetus is the parasite. Of course the vast majority of women are happily accepting this relationship. But the fetus is definitely not a separate human being.
This symbiotic relationship is not without grave danger to the mothers.
Nowadays, the rate of death by pregnancy in the USA is about 1 per 100,000 pregnancies. Just 90 years ago it was 1 per 100 pregnancies. In some countries are still 250 per 100,000 pregnancies.
Whatever the statistics, pregnancy is a serious risk to the life and health of pregnant women. It is not up to any legislator to force anyone to take this risk.