Just wondering

So I have had my iud in for about a month now. I haven’t had any problems, it’s so much better than depo for me. But lately I feel like I have been having pregnancy systems. I have been extremely tired, hunger pains, nausea when I’m in the car or if I eat or smell something. These are the same systems I had with my first two. I took a pregnancy test and it was negative. And I also have cramps in my ovaries with out bleeding. Should I retest or have my doctor do a blood test?Just wondering