Coil problems

Sally

Okay so a year ago I got the levosert iud coil and haven’t had any problems and haven’t had a single period since. However I have now been bleeding for almost 2 weeks and very heavily with pains. Also the last few times I have had sex with my boyfriend it has been very painful. I have had the coil checked and it has not moved. Does anyone have any ideas what could be going on?