You could have O'd but had a slow rise in progesterone,delaying your temp rise. I had that this cycle as well. Or, you could be one of the few that the trigger didn't work for, which I've had happen too. Do you have a link to your chart? If you don't get a temp rise in another day or two, you should tell your Dr and go for bloodwork to see if you did indeed O or not. Hopefully it's just a slow rise in progesterone.