This is my fourth month using a menstrual cup. I use a size small juju cup. Last night, I inserted the cup and I felt a pressure on my rectum. It felt plugged.... After a while, I took it out and was able to let out gas... (sorry... I don't mean to be graphic...) Also, when I was taking out the cup, I felt I was pulling at something. It felt like the cup was holding on to something and won't let go...Do I need a softer and shorter cup?