I Had An Iud Removed On Dec 16 And A

i had an iud removed on dec 16 and a new iud inserted right after the removal of the old one. i had light bleeding/spotting for about two days after the removal and reinsertion. i am not wanting to be pregnant. my husband and i had a few unprotected sexual encounters in the past three weeks, and i am feeling a little nauseated. is it possible that i am pregnant?