Cervix changes tilt?

I suppose my ultimate question is if anyone has heard of a cervix changing its tilt? Regularly?

But, on to my story for anyone curious of how menstrual cups and cervix tilt has effected my journey.

I use the FemmyCycle cup. It's an unusual design with an unusual means of working. It is like it works through magic because it is entirely unintuitive as to how it could possibly work. I switched to it because it is the only "set it and forget it" cup. There is no need to attempt to pop out the rim or make sure there is a proper seal or proper positioning. It is just fold it, stuff it, and forget about it.

The FemmyCycle instructions say it doesn't work for tilted cervixes. When I first tried it, the cup would leak all the time and nothing would go into the cup. I started wondering if I had a tilted cervix. I read the instructions more closely and discovered I was "stuffing it" incorrectly. For normal cups the recommendations are to insert with the fold facing towards the front. But the FemmyCycle instructions say to insert with the fold facing towards the back.

Voila! I insert the cup with the fold facing backwards and it works. A bit later I asked my OB during a PAP if my cervix was tilted or not. She said it isn't.

Several successful cycles go by and then bam. I start leaking everywhere again. On a whim I reversed the insert, having the fold face towards the front. Voila! Once again it worked.

Several more successful cycles go by while inserting the FemmyCycle facing forwards, and then once again: Severe leaking. I reversed the insert again... And now it suddenly worked again.

So this is how it has gone for the past couple years. I get about 4-6 months of success from the fold facing towards the back, then have to switch to the fold facing forwards for 4-6 months, and then switch again to facing backwards.

Which of course, has me begging the question: is my cervix tilting back and forth!?

Fortunately, I invested in a lot of period underwear so this occasional leaking is not a huge deal for me.

The most annoying thing is that the cup is more effective when menstrual fluid hasn't lined the vagina yet. I set a reminder to put the cup in a day before my period starts, and then I am leak free for the rest of the week, and everything is cleaner. But, if I end up with this leaking from the incorrect fold positioning, then I have a miserable messy week. It seems impossible to predict.