SKYLA IUD

I got my Skyla IUD on February 1st so it's been over 3 months. Since then I've had lots of unprotected sex and have had a lot of spotting and irregular periods (which is normal). However, I've never been able to reach my strings. I also never got to go to my follow up appt bc of scheduling conflicts. Nothing seems to be too bad, just wondering if I should worry about my periods. Sometimes I can't tell if Im just constantly spotting or if i'm on my period!