Birth control without husband's knowledge

Q: A man married a previously-married woman who has a breastfeeding girl. Is it permissible for the woman to take contraceptive pills to prevent pregnancy for one year without her husband's knowledge? Bear in mind that the woman is in good health and a new pregnancy will not hurt her. Is this permissible or not?

Q: Birth control is generally prohibited because it contradicts the Shari`ah (Islamic law) (Part No. 19; Page No. 320) that strongly prohibits celibacy and encourages marrying prolific and loving women. Therefore, taking contraceptive pills is prohibited except in few special cases. For instance, a woman may resort to taking contraceptive pills if her delivery is usually carried out through a surgical operation. The same applies when pregnancy will possibly put her at risk, such as potential diseases or the like. However, none of these cases apply to the woman in question; so it is not permissible for her to prevent pregnancy. May Allah grant us success. May peace and blessings be upon our Prophet, his family, and Companions.