I am mortified

So yesterday was me and my bf 1 year anniversary, and we were alone at his house. (This never happens) Well, we were having sex and I was being louder than usual since no one was home but us and his dogs. About 15 minutes pass and we both hear a COUGH and someone yelling for the dog. It was his roomate which is his guy friend. I know he had to have heard me and I am so traumatized from it lol. That's never happened to me! Has anyone else had that kind of thing happen before ?