I don't have cravings around my TOM, but I know a lot of other people do. Like Kimzle said, if you're hungry then eat. There are many snacks you could have that are really low in carbs but filling, like a cheese stick, a few salami rollups, or a boiled egg.
The weird thing is, my TOM just ended and I've been really close to my carb limit or even a little bit over for the past few days + I haven't lost anything. Maybe I experience backwards PMS. I'll call it post menstrual syndrome!

In all seriousness though, sometimes you just have hungry days. I had one today and yesterday.