Long cycles getting me down..

This is our first cycle of really trying. For two years now we have not been preventing pregnancy, but my cycles are really long. In June and July I had a 69 day cycle. The rest have ranged from 28 to 42 days (since January). I started taking OPKs this month and got a positive 16 days ago and have yet to get my AF. All pregnancy tests are negative (blindingly). I'm going to start temping next cycle, but I'm super down in the dumps because I'm afraid my next cycle won't be here for awhile. I'm just frustrated and sad.