Possible Pregnancy?

🖤A.R.T.A🖤
So, I got my first IUD on May 24th. They said I should expect heavy bleeding for a while, then the bleeding would stop altogether. But I have not had any bleeding WHATSOEVER. I have been nauseous and don't want to eat anything. (TMI) I've had diarrhea for almost two weeks too. I've been cramping a lot but have discharge. I'm super tired all the time also. About 7 days ago I took a pregnancy test and it had a faint line. I retested twice and it was negative. Should I wait a week and retest to make sure? The no bleeding is just throwing me off! Any advice???