Your chart looks really good. The fact that you did get a bfp is a good sign, too. All hpts are not the same sensitivity, even if they come from the same box.
I thought I might help you with the "triphasic" aspect of a bbt chart. The chart for this and last cycle don't show triphasic patterns. A triphasic chart starts low in the follicular phase. It may bounce up and down a bit with the estrogen surges. But, will generally stay below the coverline. Once o occurs and the temp shifts upward, you draw a line in the middle of the area from the top of the 1st spike and the last low temp. This becomes what is called the coverline. It can be a little higher or lower. It really isn't that important as to where it is exactly. If the temps climb to a 3rd level, another coverline is drawn. The temps will stay above the 2nd coverline for at least 5 days to be considered triphasic. If they dip back into the range of the 1st coverline, it is not triphasic.
It's kind of hard to grasp from a definition. I was looking for some tri charts to show you. Basically, the chart looks like 3 stair steps with each phase of temps staying in that step. It doesn't go up and down. I hope this helps. Good luck! I can't wait to see that bfp post!
I had a huge dip at 12dpo and thought for sure AF was on the way. 2 days later I got a BFP and am now just over 6 weeks pregnant. Take a look at my chart. It is on my page under pictures.