I'm not even sure if I have a low cervix but for the last few days when I've been using my cup it's been going in but then it slips down after a few minutes so I can feel it a bit when I'm walking. I'm putting it in as far as it'll go, and I did trim the stem. I haven't had this problem until yesterday and I've inserted it maybe a total of 10 times now. I have a medium flow on the first day and a light flow the other four, so I can use a shorter one if need be. My current cup is maybe like 2 to 2.5 inches long. So I have a few questions:

-would my vagina become longer and shorter based on where I am in my cycle?

-could this mean I have a low cervix?

-do you have any cup recommendations that are a bit shorter in length?