There are dozens of Hebrew books available on taharat hamishpacha and related topics. Here are a few titles:
Rabbi Yehuda and Rabbanit Chana Henkin, eds. Nishmat HaBayit. Jerusalem: Midreshet Nishmat and Maggid Books, 2017. 367 pages. Halachic responsa in the areas of pregnancy, childbirth, breastfeeding, and family planning, written by a team of Nishmat's Yoatzot Halacha.
Rabbi Feivel Cohen. Badei HaShulchan. New York: Jacob Joseph School Press, 1982. Hilchot Niddah (Yoreh Deah 183-196), 319 pages. Hilchot Tevilah (Yoreh Deah 197-200), 149 pages. A Hebrew commentary on theShulchan Aruch, similar in format to the Mishneh Berurah.
Rabbi Mordechai Eliyahu. Darchei Taharah HaShalem. Jerusalem: Machon Torani Darchei Hora'ah LaRabbanim, 2011. 336 pages. A clear, practical and detailed presentation of the laws of niddah, according to both Sephardic and Ashkenazic customs.
Rabbi Yekutiel Farkash. Taharah K'halacha. Jerusalem, 1998. 766 pages (2 volumes). A clear and comprehensive presentation of the laws of niddah with extensive footnotes.
Rabbi Elyashiv Knohl. Ish v'Ishah. Ein Tzurim: Yeshivat HaKibbutz HaDati, 2002. 247 pages. A clear and friendly guide designed for chatanim andkallot. Includes a thorough and detailed presentation of the laws of niddah and the principles behind them, as well as sections on the wedding andsheva brachot, shalom bayit, and a separate pamphlet on marital intimacy. Presents both Sephardic and Ashkenazic customs.
Rabbi Auriel Silbiger. Chinah shel Chanah. Jerusalem: Feldheim, 2002. 88 pages. A clear, concise presentation of the laws and meaning of three mitzvot: taking challah, lighting Shabbat candles, and family purity.
Rabbi Ovadia Yosef. Taharat HaBayit. Jerusalem, 1988, 2006. Three volumes. A concise practical guide (Taharat Habayit) with very extensive scholarly notes (Mishmeret HaTaharah), in the Sephardic tradition following the rulings of the Shulchan Aruch.
Please note that contemporary halachic authorities may have slightly different approaches to certain questions. Therefore, you may find occasional discrepancies between the rulings of the various books and websites available. If you are not sure how to conduct yourself, an individual question should be asked.