iud late period

Mia

My period has always been irregular, but being on the IUD has made it regular for once in my life. My period is now 6 days late. I’ve been feeling extremely tired and I’ve been losing weight. I am also 18 months postpartum, if that matters. Has anybody gotten pregnant on the iud? And if so what were your symptoms? I think I ovulated late, I think I’m 10 dpo.