Pain during sex

So in April I got the Mirena IUD and I waited a week after placement before having sex as recommended to avoid infection. Since then I've seen my boyfriend about once to twice a week and we have as much sex as possible when we see each other. I've never had any pain during sex before, but today, when we did the doggy style position, it felt as if there was a sharp pain in my cervix every time he went in. I didn't say anything because it was bearable, but it was uncomfortable and not something I've ever experienced. Should I be concerned?