Where O where is my eggie?

Here I am on cycle #11, CD 19 and still waiting to O. For those of you who don't know a woman's cycle is supposedly 28 days long with ovulation happening on CD 14. I rarely ovulate on CD 14 but it does usually happen before CD 18. I chart my BBT every morning. The idea with BBT charting is that after ovulation your temperature will go up noticeably. My temp has yet to go up. So I go on waiting......