I understand your concern and your problem.
This may happen in the following scenarios.
1. The nuva ring is broken; sometimes the joint of the ring is broken so it may not regain back its desired shape once inside the vagina and slips out. In this case try a new ring.
2. The vagina is lax and roomy. Sometimes vaginal laxity may interfere with holding the ring in place, this is very rare and unless the vagina is too lax, it does not slip.
3. ring not pushed far enough; sometimes women do not push it far enough inside so that it remains at the vaginal opening and slips out.
The first and third are common likely causes. Check to see if any of this is happening with you.
If the ring is broken use a new one and use some other method like condom for next 7 days. If you are scared to push it in, I want to reassure you that don't be afraid. this ring is safe and will not go anywhere other than the vagina. It does not cause any trauma so it is safe. Just push it way inside so it will not slip. The best position to do this is lying down and slowly pushing it inside towards your buttocks that is backwards.
A tilted uterus
will not affect the position of the ring and neither will it have any effect on its insertion.
Another word of caution is that if the ring has been lying outside for more than 3 hours, use another method like condom for the next seven days after correctly inserting the ring.
Hope I was able to help you, Thank you for using HCM and have a nice day.