You could be having a late O. It's also possible that you started charting on one of those cycles where you just don't O for some reason. I've read in several different places that it's normal for a woman to not O 1 or 2 cycles each year. I wouldn't panic over just one chart yet. I know it's hard to be patient when you want a baby RIGHT NOW, but it might take a few months to know for sure if you O or not.

and lots of *~*~*patience*~*~* dust to you.