Dr mindy pelz specifically talks about this in her video. Basically you want to stop fasting 7-10 days before you bleed and then once you start bleeding you can start fasting again as much as you want. (Until your next cycle. I’ve been doing this and it’s been really helpful in how I feel! And not silly at all. Best of luck!
Awhile ago I listed to a Diet Doctor podcast about IF with a woman who said she has her clients either stop IF or modify it depending on where they are in their cycle (can’t remember it exactly but women’s hormones affect how they should eat). I can’t remember who it was but listen to your body.