Im on the IUD but have been feeling dizzy, nauseous and sick lately. My coworker said I could be pregnant. Im on my period now but its the weirdest period Ive ever had. Its super duper light and all brown. No red at all. I have always had a really heavy period. Ive been on the IUD since november so its weird that all of a sudden it would change like that. Could I be pregnant, even with the IUD?