NEED ADVICE

Kristen
Hey Everyone, 
So I am almost 30 days late on my period. I have an IUD and I know that can cause loss of periods but I have had it for a year and a half and before this point I was on a cycle of getting my period every 35ish days, until about a month ago. Originally about 7 days after I missed my period I took a pregnancy test and then took another one 2 days later and they were both negative. Just trying to get advice from women on an IUD who maybe this has happened to or anyone that has advice for me. 
Thanks 😊