Should I worry?

My husband and I began trying for a baby for about 20 months now. I am 21 and he is 25. We have not been "actively trying" meaning that I track my periods and what I believe are my fertile days. (I have very irregular periods so that is a task in itself.) I have never charted temp, but I do track my cm using the glow app. Anyway, should I be concerned that we've been trying for 20 months now and I have never seen a bfp at all?