The quick answer: Yes.
Barrier methods, spermicides or natural family planning, when used properly, are very close to being almost as effective as the Pill, the IUD or other combinations of drugs and devices. Warning: providers who favor the use of hormone-like drugs in pills and devices ignore the small difference in their “use effectiveness” and base their recommendation on the more impressive difference between the “theoretical effectiveness” of barrier methods, spermicides and natural family planning, and the more problematic drugs and devices. The manufacturers of these products employ “detail men” to hype the latest formulas and gadget designs to practitioners.