iud_divas have an IUDs and menstrual cups (http://iud-divas.livejournal.com/tag/iuds%20and%20menstrual%20cups) tag that might be a useful resource for you in addition to the answers you get here :-)
The summary seems to be that after the first few weeks with an IUD there is no particular risk involved in using a cup. Certainly I used a cup (Mooncup UK) while I had an IUS (Mirena) without problems; I did take extra care to always break the seal thoroughly before removing the cup, and I did check my strings regularly, but that was all. Anecdotal evidence seems to be strongly in favour of "it's fine".
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Date: 2011-12-30 05:43 pm (UTC)The summary seems to be that after the first few weeks with an IUD there is no particular risk involved in using a cup. Certainly I used a cup (Mooncup UK) while I had an IUS (Mirena) without problems; I did take extra care to always break the seal thoroughly before removing the cup, and I did check my strings regularly, but that was all. Anecdotal evidence seems to be strongly in favour of "it's fine".