I’m late

KSV

I have the IUD but I’m 3 days late on my period and my cervix is high , I haven’t taken a pregnancy test because last time I was pregnant I kept getting negatives all the way until I was 2 months pregnant. I know the IUD is a really good birth control but I’ve still heard of women getting pregnant with it . What do you guys think I should do or what do you think is going on ?