From Sahih Bukhari (Hadith 298):
Narrated Um Salama:While I was laying with the Prophet (ﷺ) under a single woolen sheet, I got the menses. I slipped away and put on the clothes for menses. He said, "Have you got "Nifas" (menses)?" I replied, "Yes." He then called me and made me lie with him under the same sheet
Reference: Bukhari 298