Can someone please explain the cycle to me?

I have irregular periods, usually 40 days. So I had my AF last on May 23, then I started doing my OPK starting then. I got a surge in June 11, it was my first month TTC so I BD during that next week. It's now June 29 and I still don't have AF and I keep getting BFN. Did I ovulate later than I thought? I followed the OPK results. I'm such a TTC newbie, I don't even understand how come my TWW turned out to be so long. Anyone able to explain to me and help ease my anxiety?! I get irregular cycles so I don't even know what to expect.