IUD removal with pregnacy side effects?

Patient: I had an IUD (paragaurd) removed last month. Since then sexually active. I now am experiencing constant burping, nausea, extremely irritable!, and insomnia. I have taken a pregnancy test since I have missed my period by 5 days and came out negative. Are these syptoms of an non-hormonal IUD removal. Could this be a false negative pregnancy test. My last OBGYN appt was last month with a clear pap.