Scared I might be pregnant

Ok ladies so I'm scared I might be pregnant. I have the PARAGUARD IUD since April 2018 and ever since a couple of days ago, I've been feeling nauseous. I'll be eating something and suddenly I just throw up or the feeling of throwing up is there. Ughh IDK. I dont want to tell my husband because he will freak out. Plus the thought of being pregnant with a IUD is freaking me out. What can this be ? I cant take a pregnancy test atm because my period is supposed to start in a couple of days more. By not being able to take a test atm means that since my period is not due for a couple of more days, a positive is most likely to not appear.