I suppose you are talking about divorce. In the case of divorce, the waiting period is 3 menstrual cycles. If she is beyond menopause such that she no longer experiences menstruation then it is 3 months and likewise if she has not get begun menstruation due to young age. A pregnant woman waits until she gives birth. This is only with condition that the marriage was consummated or khalwah sahihah occurred, which means they were alone with no impediments to consummation. If these did not occur then there is no waiting period after divorce.