I have an IUD and it usually doesn't give me any problems. During sex last night I got an intense cramp along my lower abdomen. Like long ways. It felt kind of like when you get a Charlie horse in your foot and you have to straighten it out to get it to go away. I had to arch my back for about 15 seconds for it to quit cramping. A little worried I just tried finding my cervix and feeling for it or the string, but I can't tell what's what in there, even though my doctor explained it to me. Gynecologist is closed today. I've heard horror stories of people having to have their ovaries removed or something because an IUD got knocked out of place. I'm 23 and still want to have kids. I might just be paranoid, but is this something to worry about?