What happens if i get pregnant while i still have the progesterone iud in place?

Depends on LMP: We usually recommend removal. While removal might cause you to lose the pregnancy, leaving the IUD increases the risk for severe intrauterine infection. As well, the progesterone, like depo-provera or norplant, (levonorgestrel) might increase the risk of a tubal pregnancy, therefore an ultrasound to determine where the pregnancy resides is as important as removal of the iud.