Social history needs to be taught in schools!
People have such a warped view of the lives of ordinary people in centuries past.
The Victorian age was so significant that lots of people assume life then was life in the centuries preceding it.
I'd much rather have lived in the 18th century than the 19th!
A significant minority of women have always remained unmarried. There were maiden aunts, war widows, nuns, missionaries, governesses, prostitutes, slaves, lesbians, domestic servant's & 'unmarriagable' women eg disabled women.
Childbirth can be more dangerous now because women have bigger babies, at older ages, when they have existing ill health, obesity, babies with men outwith their 'village' so can have disproportions in hip/head size.
The first birth is the most dangerous. After than maternal mortality decreases significantly.
In the past the mother's life was worry more than the baby's so brutal measures were taken to save the woman at the expense of the baby.
Maternal mortality peaked when men got involved in births and didn't wash their hands between patients.
This is what killed Mary Wollstonecraft.
But ordinary women gave birth in what were actually safer conditions.
Women didn't have huge families until formula milk use became commonplace. This allowed much more frequent pregnancies. Prior to this babies were breastfed for 2-4 years which acted as a contraceptive meaning longer gaps between children. It was also not uncommon to not get married until late 20s/30s.
Women weren't all so ignorant in the past either. We've had daily newspapers for over 300 years. Women shared knowledge and knew how to use various types of birth control eg abortifacient herbs, sponges, withdrawal, cycle timing, douches, condoms have been around for centuries!