Pregnant on the iud?

I got my iud at my 6 week pp apt. March 22. Never had a period up until last month on the 25-29 of june. I’m supposed to get it since yesterday. Haven’t got it yet—My ob said my period can completely disappear, or be normal. But never mentioned irregular. So that means i’m 1 day late almost 2 on my period. My hubby finishes inside me every time we have sex which is almost every day. I know there’s always a slight chance of pregnancy but has anyone been threw this? Just missed their period on the iud and NOT pregnant ?