To what extent? Does he know start/end date? Flow?
I'll mention to him when it starts. He will probably understand that's why I've been such a bitch lately. Eventually he'll forget I'm having one. I don't tell him when it ends. When we had fertility issues and were TTC, he would ask about my fertile period. I don't think I've talked to him about flow and such because he doesn't like talking about blood. He'll probably pass out if I talked about my flow. Haha