Tampons/Cups = cramps?

i usually wear pads, but they make me feel kind of gross, so i’m trying not to anymore. i tried tampons, but they gave me the WORST cramps, so now i’m trying a menstrual cup (organicup). but that makes me cramp too ??? any ideas why or suggestions? it’s like any time i put a menstrual product in my vagina i have terrible cramps