How to answer "any chance of pregnancy?"

I am 29, in a long term relationship, sexually active, and have an IUD. I hate when I go to the doctor and they ask "any chance you might be pregnant?" Because I mean, YES! There's always a chance that if you're sexually active that you might become pregnant. Shortly after getting my IUD I had asked my GYN to do an ultrasound during my visit because I was having multiple new symptoms consistent with pregnancy but pee tests were negative. She kept being rude and telling me you can't get pregnant with an IUD but literally if you look up the effectiveness of an IUD it says 99% but not 100%.

So like how do you answer that question? I answer no because I know that's the "correct" answer or at least the one they expect but I never feel good about it.