Copper IUD question

I know there is an IUD group for these questions but I also wanted to ask it here.

So I’ve had my copper IUD in for about 3 months now, I’m just wondering if it’s normal to skip periods with the paraguard? My period is now 5 days late, I had the Mirena for almost a year before switching due to hormonal complications but I always had a period with it... so I’m just wondering if this is normal with a copper IUD or should I be concerned about possible pregnancy?