If a woman conceals what is in her womb by saying she is not pregnant while she is , or sais she is not menstruating due to pregnancy while in fact she is menstruating, many harms can occur a sa result. Her 3idda can be extended due to the lie, and her husband would be forced to continue spending on her money that would not be her right to have, because a husband is obliged to spend on his wife during her 3idda or waiting period, assuming it is not finalized divorce after the 3rd. In addition, he might decide to be intimate with her, which is permitted during her waiting period and as a result resumes the marriage, and if she lied about still being in her waiting period while in fact she was not, this sexual relation would be considered zina as she is no longer his wife. This is why the severe warning for the woman to be truthful as to the condition of her womb during this time after divorce.

Had it not been for the 3idda or waiting period for a women after divorce or seperation, many matters would have been confused. If she remarried immediatley while unknowingly being pregnant from her previous husband, the child can be attributed to the wrong father. If that happpens, inheritance wont be distributed propery, a person might unknowingly marry his own mahram in the future, and relation of kinship would be unknown and thus cut off.  So this sheds light on some of the wisdom behind the need for a waiting period for woman rather then men.