Iud in lower uterine seg. @last u/s. feeling strange, pelvic tugging, palpable uterus (i think: fist sized swelling mid pubic region), nausea. ?

What's your question: Presumably you're wondering if you're pregnant. If so, take a home pregnancy test. While IUDs are amazingly effective, partly b/c they take out human variable when it comes to adherence, they're not infallible. So if you're worried about possible pregnancy, home pregnancy tests are inexpensive, available w/o prescription, and highly accurate (just as good as those in doctor's office).