Far be it from me to know what context Calvin was discussing contraception. But it's clear from the snippet you offered that Calvin is preaching against avoiding having children in general (much like when the "alter Christus" denies himself a wife and family.)
Abortion is a sin. But barrier contraception is legal, moral and up to the discretion of a husband and wife.
As I said, please continue to have crotchety old celibate men and the pederasts among them keep telling women they must have a child for every year they are married in order to swell the papist ranks.
Many of those families will see this as one more good reason to depart Rome and find themselves in a Scripturally-faithful church which acknowledges no mediator nor redeemer but Christ.
You acknowledge that you started a whole new thread to grind an old axe? You even copy in posts? Listen to Theo.