The Prophet (peace and blessings be upon him) said:
"A pregnant woman is not to be had intercourse with until she gives birth, nor one who is not pregnant until she has had a menstrual period."
Hadith Referenceصحیح الجامع الصغیر / حرف اللام ألف / 7479
Hadith Gradingالألبانی:صحيح
Hadith Takhrij[حم د ك] عن أبي سعيد. المشكاة ٢٣٣٨، الإرواء ١٨٧.