Help Please!!

Kasha
So I've had my IUD for about a year now. A month into having it I had a check up and it had fallen out of place so they did a hysteroscopy. The doctor said after that there was no need for condoms and I have been going for 10 months with no complications and I NEVER use condoms with my boyfriend. 
My period is 6 days late now. Should I be worried about pregnancy? Or is it just something to do with the IUD making my periods irregular? 
(The reason I ask about irregularity is because I haven't kept track of my periods until now so I'm not sure if I'm usually irregular or not) 
HELP ASAP, PLEASE, IM GETTING A LITTLE NERVOUS 😳😳