menstrual cup inserting

Hey ladies, I'm a first time cup user and I'm not 100% sure it's installed correctly.. I folded it and put it in, then tried to use my fingers to force it to unfold. But there feels like there's an indent in the cup area that didn't get unfolded.. When I try to pull it out to reinstall there's a good amount of suction from the cup so I can't just pull it out.. Is feeling this indent normal and is feeling that there's suction enough to confirm its installed correctly. Thanks!