Tips even you're irregular?

Tosha • Mother of one expires Dec 24th, 2017!
I've been using Glow since May and I love it for the community and the fact that I can actually chat when my period is BUT .... I have irregular cycles ranging from 27days to the most recent 68days! Because of this I never know when it if I am ovulating and Glow can't exactly figure it out either. I've was tested for pcos and endo both when I was 17 (currently 26) and the tests were negative for having either. I just got told it is how my body is and there's no real reason why.... (I don't really believe this tho). Anyway, I did have a child, my beautiful daughter Shyla, in 2011 after going through a birth control regimen to try and regulate my system (also to help ward off cysts that started to appear regularly) but conceiving her was basically an act of God so says my Drs. I was on Implanon the bc implant until May 2015. So without dealing with all of that again, does anyone have any tips for conceiving with irregular cycles? I really want another baby and I don't mean to sound selfish because I know many women haven't even been blessed with #1 yet but it's killing me to think I may never have another baby. Help!