You are not the only one thinking in this direction. A lot of people are a little scared in the beginning to try menstrual cup as they have this question in mind.
You don’t need to worry at all. I always recommend everyone to measure their cervix before buying a cup. This not only helps you select the right length of your cup, but also makes you more aware of your body’s anatomy.
Once you measure your cervix, you will realise that there is very little room inside the vagina and a cup cannot get lost in there. At the most, (if you have a high cervix) it will ride up in the vaginal canal.
All you will need to do is to relax and push it outward with the help of your vaginal muscles (as if pushing a baby or trying to poo). This will bring the cup closer to the opening. Now you can easily remove the cup.
And if you are still scared, you can try cups with ring style stem and tie a cotton thread – just like a tampon!