Is it permissible for a wife to delay pregnancy for a year and a half using birth control pills on the pretext of completing her studies?

Among the noblest aims of marriage is the attainment of progeny. The Prophet, peace and blessings be upon him, encouraged marriage to the woman who is loving and fertile, because it contributes to increasing the Muslim nation. It is permissible to delay a woman's pregnancy if there is a benefit that necessitates it and both parties agree; otherwise, it is forbidden.