Pain during sex with IUD

Does anyone else feel discomfort when having sex with an iud? Apparently I have the only copper one on the market for nuliparous women (Flexi T 300) but I still feel discomfort with certain positions. I put up with it and we usually just change positions when it happens. But it happens every single time we have sex. It's really frustrating. I really love all the benefits of the copper iud, (I had difficulty remembering to take my pill and I wanted to get off fake hormones) but it's just so annoying and I feel guilty when I have to make my husband stop . Any advice?