Weird question but umm: how did the female demigods deal with periods? [pjo] [hoo]

Like if you actually think about it, there's mentions of bathrooms at camp so obviously that'd work, the Argo II must've had bathrooms, and there's mention of it in BoO when Reyna uses the bathroom, so those definitely check out.

But say during one of the wars (doesn't matter which) and you're a female demigod and you suddenly get insane cramps, like the debilitating kind, how exactly do you deal with that in the middle of a WAR? You can't really step away from the fighting without meeting a bunch of monsters that clearly don't care about demigods' personal problems since they're too busy trying to kill you and everyone else, and it's not as if the demigods can control when the wars start/end, so uh yeah... how??