while, it might help to take a break. go do something else for a while to let your body relax. the cup can not disappear into your body, and it can stay for up to 12 hours - so there is no need to panic! if you get stressed, your muscles will tense and it will make it even harder to move the cup. so try to relax. if the cup has moved far up, squat and bear down on the cup to move it lower.
if the cup has move up only a little bit you can use the stem to gently easy it lower to where you can grab 