Hadith 10:1381
"And it is not lawful for them to conceal what Allah has created in their wombs." He said: It is not lawful for the divorced woman to say, "I am menstruating," when she is not menstruating. And she should not say, "I am pregnant," when she is not pregnant. And she should not say, "I am not pregnant," when she is pregnant.
حدثنا أبو بكر قال نا شبابة عن ورقاء عن بن أبي نجيح عن مجاهد @QB@ ولا يحل لهن أن يكتمن ما خلق الله في أرحامهن @QE@ قال لا يحل للمطلقة أن تقول إني حائض وليست بحائض ولا تقول إني حبلى وليست بحبلى ولا تقول لست بحبلى وهي حبلى