AF is here :(

So I got AF super early.. I'm not disappointed I'm not pregnant this cycle, I knew this month was pretty much a dud. I'm just not understanding my cycles - they can vary anything from 28-34 days, and I can O CD14-20.. There seems to be no pattern to it. I didn't even get a positive opk this cycle so that's confused me even more. Plus my hubby has an on/off libido which makes things extra complicated. I'm just trying to have a baby here - but my body isn't cooperating :(