My dd is 12. She got her pariod for the first time at age 11. She's always just used pads. Well this morning my sister called because my dd was over there spending the night. This morning my dd got her pariod but all my sister uses are tampons. I've always been scared to allow her to use tampons. I heard a young girl shouldn't use tampons until she's at least sexually active. How true is that? Am I just being over cautious?