Cycle buddy? :)

Hi! I'm 22, and I've been married for 9 months. We are currently foster parents, but we want to try for our own. I take lexapro for anxiety, so I'm nervous about whether or not I can be pregnant while taking it. I go to my obgyn on June 10th for a consultation. My fertile window should be from June 26-July 1. My cycles average 34 days but they tend to be 2-3 months regular, one month way off, then 2-3 months regular, and so on. I'm going to be using opks.