Iddat is usually noticed in the following manner;

Then the Quran has specifically explained the situation in such words, women who are divorced shall wait, keeping themselves apart, three (monthly) courses if the marriage is terminated by divorce or in consequence of annulment by the Court. Which is perhaps perhaps not legal if they are believers in Allah and the last day for them that they should conceal that which Allah hath created in their wombs. Which means divorced girl is likely to observe Iddat for three cycles that are menstrual.e. the time of three complete courses of menstruation.

Within the above two situations then after the termination of marriage the woman is not required to observe Iddat if the marriage has not been consummated nor any valid retirement has taken place. Read more