I've actually heard that a lot of people who have cramps with tampons don't get them while using Insteads. However, if you are only getting mild cramping and you are just starting to use them, it's possible it could be your body getting used to it. If it doesn't leak or anything, I wouldn't assume that it is in wrong, but maybe be extra careful next time you put one in to make sure you put it right where the information about it says to and see if that helps at all.