IUD, Working Out, & Cramps

Hi everyone!

I’ve had my IUD (Skyla) for 2 years now. I was a college athlete whenever I first had it & had no issues! However, I took a year off to recover from a knee injury. I’ve started working out again, & I’ve been having cramps mixed with the soreness in my core from working out my abs. My period isn’t due soon, so the cramps don’t make sense, & the only thing I can think of is working out again. Is this normal? I have my yearly appointment with my OBGYN in a few weeks, but just wanted to make sure nothing is wrong!

Thanks :)