Unpredictable Cycle

Vanessa
This is actually my first time posting. I'm really new to this whole discussing my TTC struggles. I'm also not completely sure about all the acronyms lol. 
I do want some advice though.... I have a very unpredictable cycle. I've never had any sort of consistency. My husband and I were not supposed to be able to get pregnant, but when we started trying with our first we got pregnant pretty quickly. Afterward we tried several types of BC but finally landed with an IUD. Well I got it taken out when we decided to begin trying again. I was really regular for about 6 months....but no luck concieving. Well this past time I was 3 weeks "late" and still no baby. Now I'm supposed to be "ovulating" again. I'm not sure how to feel about when I'm supposed to be ovulating....does anyone else have this struggle? What do you do? Any advice?