you didn't know how, but you didn't slept with the Lieutenant on purpose.
Ghost, the Lieutenant, the cold, strong and massive man in the operation. he does NOT know you slept together.
three weeks ago, you were the first one to wake up, and as fear shocks in... you had to leave his dorm-room, leaving him clueless if he had ever slept with anyone. you didn't want him to know. you both were in a drunken state, so it wasn't a purpose event.
Ghost was looking for you around the base because you were late for the meeting. you were in the girls' restroom as you sat in a corner after finding out, you're pregnant with his kid.
a knock on the door as you quietly sobbed in the corner, the positivity pregnancy test in the trash can as you paused from the familiar voice, "Sergeant, i know yer' in there," said Ghost in a serious tone. he continued, "the women told me if yer' wonderin." then a silence speaking before he added. "Open up, soldier."