In the middle ages a pregnant women was per se decriminalized = not responsible for her deeds. The reason was the very strange behavior some women show, while they are pregnant.
What "strange behavior"? Pregnancy is a process of manufacturing a human body, including a complete skeleton, which requires certain nutrients, and hormones cause "strange behavior" in men and women alike.
Today I don't know how many women agreed with an abortion, although it never ewas their real will to do so - specially when they were under pressure to let make an abortion from their lover, partner and/or parents or others authorities.
Yes, you don't know how many women are under pressure to have an abortion as opposed to women who made the decision for themselves, so using duress as an argument is based on speculation only.
Masses of women had and have the feeling they are lost, because they are pregnant, and so they abort
Again. Speculation. Nobody can know, accept the individual woman in question, what her feelings are, and certainly not a stranger.
There is a stupid and offensive tendency in our society, and in others, to put words in women's mouths and to ascribe to them "feelings" which they may or may not have, based on someone else's conclusion that they "ought" to have these feelings. All this amounts to is subtle and not-so-subtle manipulation.