Just a little punctuation confusion

Jackson: "Mama? What does 'period' mean?"

Kat [running through recent conversations in his presence to remember when she had mentioned anything remotely menstrual]: "In what context? Where did you hear the word used?" [thinking about the 5 year old explanation of women's cycles...]

Jackson: "You just said it! You say it to your phone all the time! 'dinner is in the oven period'"