Pregnant?

I have an IUD, and my SO never pulls out. Well my period was literally 2 days with a few spots here and there. I’ve always had heavy periods even with my IUD and my obgyn said they shouldn’t stop because they were heavy. Well I’ve had pregnancy symptoms (sore breast, light cramps, nausea, fatigue, dizziness), and I was wondering if any of you had ever gotten pregnant with an IUD. If so, what were your symptoms, and what did your doctor do?