getting pregnant with iud?

(I’ve had my IUD for two years, had my annual checkup with my gyno last fall and everything was normal / in place.)

Lately I’ve been so irritable and having the worst heartburn. I get it daily, and I remember my mom telling me she had horrible heartburn everyday while pregnant with me, so I can’t stopping thinking if I’m possibly pregnant. I’ve also gained some weight in the past few months, but I haven’t really changed any eating habits. I’m not home now and don’t have a test with me, but I will be tomorrow to do so.

Can someone please tell me the chances? When my boyfriend and I have sex, he doesn’t even finish inside. The last time he did was probably like 3-4 months ago.