I know this may seem like a strange question and I don’t know much about  TSS but I was under the impression that it’s caused by old blood re entering the body from waiting too long to change a tampon. My bf and I rough house a lot and sometimes he’ll pick me up and I’ll be upside down over his shoulder or something. In this  instance blood inside the menstrual cup would leak back in, no? Since it’s upside down? Curious if that’s a reasonable concern since my first menstrual cup is on its way.