Pain after sex mirena iud ?

Had it for almost 3 years and now I’m having pain after sex . Like last night me and my boyfriend was doing doggystyle and 2 mins into it I get a sharp stabbing pain like I tensed up and everything then I had a big ass cramp it felt like my inside were being torn up the cramps lasted a min then stop I been having problems with it hurting during sex for a couple of months now but last night was the first time I wanted to scream out in pain , my string are still there and they always feel like they got shorter but idk if that matters cause sometimes the feel long to

But I don’t have any insurance and I don’t have 500$ laying around for a co pay ... idk wats happing