Which preposition to use with pregnancies

OF Occurrences 20%

HE WAS OF AN ADMIRABLE PREGNANCY OF WIT, AND THAT PREGNANCY MUCH IMPROVED BY CONTINUAL STUDY FROM HIS CHILDHOOD: BY WHICH HE HAD GOTTEN SUCH A PROMPTNESS IN EXPRESSING HIS MIND, THAT HIS EXTEMPORAL SPEECHES WERE LITTLE INFERIOR

at Occurrences 1%

To the husband for wife's pregnancy at time of marriage unknown to him, adultery of wife, or such conduct as proves her to be unchaste without proof of adultery, and habitual drunkenness of wife.

for Occurrences 1%

But the accidents and vicissitudes of life (pregnancy for example) will upset the balance.

as Occurrences 1%

A young slave woman, Becky by name, had given pregnancy as the reason for a continued slackness in her work.

than Occurrences 1%

It took no more than a glance to reveal the fact that she was further along in her pregnancy than MarnaMarna who started back from the door when a stranger appeared at it lest she should seem immodest.

with Occurrences 1%

More recently, a British student of the subject, Blair Bell, was given the direction of the treatment, at long range, of a number of cases in India, the land of chronic pregnancy with insufficient food, and consequent oversecretion of the ovaries, with the typical softening of the bones.

in Occurrences 1%

Perhaps he saw a certain pregnancy in the station-master's eye.

Which preposition to use with  pregnancies