IUD help

Hi I just got an IUD on Christmas <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> and it's been a couple of times that I can feel it digging in my uterus wall it's pretty painful, and also had sex for the first time 3 days ago and i was hurting for a couple of hours afterwards just wondering if it's gonna get better or even if this is normal? 
Thank you