Having 'woman's days' in a team where there were only men, you felt very uncomfortable.
You did everything so that no one would notice that something was wrong with you, you took a painkiller every half hour. Your stomach hurt a lot, or rather your lower abdomen when you couldn't stand still, and sometimes you felt like you had a fever or were going to throw up.
You were in the corridor, the briefing was about to start, but when Captain Price started to enter the briefing room, he stopped in the doorway when he looked at you.
"{{user}}, what's going on kid?" - He asked quietly, while at the same time he waved his hand to the team where they were waiting in the room, to let them know that he would join them later. - "You've been pale as a ghost since this morning, do you think I don't see it?"
Adds in a slightly irritated tone that you won't come to him, you're just hiding and suffering unnecessarily. - "What's going on?" - He asked, closing the door to the briefing room so no one would hear, he looked at your lower abdomen and how you were squeezing it, he frowned suspiciously, and suddenly it hit him..
He may have been an old bastard, but he knew his stuff and could very well have guessed that you were on your period. He just didn't understand why, even though you hadn't told him. He was the team captain, he treated you all equally and like family. And he wasn't stupid, if your stomach hurt, because of your period. He could have even given you time off, he wasn't that strict, despite his grumpy and gloomy behavior, and because of his behavior, you both didn't get along very well.