Yep, girls talk about any and everything. Trust me, they hold NOTHING back! Best thing you can do when asked about your period is give a vague answer like:
- I had no idea it showed
- Looks like it won't be long now
- It's certainly my gripy time, know what I mean?
- Seems like that's always the case
- If not, something's got me pms-ing.
It's also not a bad idea to carry a panty liner in your purse. I actually got asked for one in a rest room. I happen to have "borrowed" an old purse that had a couple inside the pocket.
Good luck!

Kristi