I've been lurking for a bit and have been reading a lot before and since getting my first cup (a Lunette 2). I got it and for the most part it has been going exceedingly well. Honestly I've been converted and never want to go back (why did it take me until 26 to find these things?!?!!?).
Anyway, on to my question. I have an IUD (Paraguard) and have had it for 3 years almost 4 now. Normally my string is curled around my cervix, and because of that I figured I'd give my cup a few tries before I went and got it cut (it is a medium length if I remember correctly). It will occasionally drop some, but like I said it stays curled for the most part. I've been very cautious with my cup so far (been using it for four days) and I will break suction (I can hear and feel that happen) and then fold it as I remove it (I've found it a lot more comfortable and less stressful as I've been a little stressed about dislodging my IUD :P). I removed it this last time and when it was out I could feel the tip of my string poking me, so I went inspecting. It was just uncurled, it hadn't felt like I'd pulled it, no pressure from my cervix or my IUD and I can feel that it is still in place and not dislodged.
But, I couldn't find many, any really, accounts of this happening. Is this normal? Should I hold off on using my cup until I get my string cut, I just keep an eye on it and a feel for it (make sure I remove gently and carefully) and chalk it up to me poking and prodding a lot while trying to get the hang of insertion/removal? I took it out for a few hours and may leave it out over night to give my string a chance to curl up again (if it hasn't already). I know I'm probably being overly paranoid and anxious but I felt stressing myself out would just make it harder to reinsert my cup (I'm still trying to get the hang of that bit) and possibly make me do something stupid, so I thought it best to take a step back and relax.
On a positive note I adore my cup and the idea of giving it up is unacceptable after how well it has gone in the past few days. I can't use any hormone based birth control, so I'm even surprised about the level of my affection for this cool little device as I can't simply get another form of birth control and knew it was hypothetically an issue to have a cup and decided to pursue it anyway - telling myself that at the first sign of any issue at all I would ditch the cup and go about my life (even though I have found more information lately, much of it thanks to this group via links and other comments, that basically gave me hope that a lot of this fear and weariness is more do to a lack of information than any particular danger due to the two being used together).
Thanks in advanced for any comments and help you guys may have to offer me :)