Now when I say catholic theology I am talking specifically about the pope and bishops in Rome. They still do not like governments allowing abortion and contraception for they see governments as making the corruption of humanity easier.
Now individual Catholics (not necessary, priests, bishops or popes) in the US do not see contraception as a sin. 58% of Catholics think government should require insurance plans to cover contraception at no or low cost. Note these are numbers of Catholics that think government should require it.
The number of catholic women who have used contraception is 98% (contraception being defined as any form of contraception besides natural family planning.). Natural Family Planning is the only form of birth control the catholic church allowes what natural family planning is trying to guess when a women is ovulating and when she is not based on measuring the temperature of a women body and keeping track of her past periods. During the times a women ovulates you simply don't have sex (and thus no chance of a fertilized egg.) The problem of natural family planning is a women menstrual cycle is not a precise clock and it can fluctuate (god has his say )