I am fairly new to menstrual cups. I am 32 and have vaginally birthed 2 babies. My youngest is almost 2. I have been using the moon cup, size A for a couple of months. I have had pretty intense discomfort all day today (day 1 of my cycle.) It borders on being painful, is similar to cramping but seems more in my vaginal canal and almost radiates to my rectum. I took the cup out this evening and the discomfort was gone almost immediately. I do not want to go back to tampons but also don't want to be in pain. What could be causing this? And how do I correct it? Is it the type of cup, positioning etc.? Please help, and thank you in advance.