I am so sorry for just now getting to this. I haven't been feeling too well the last coupl days.
I think your chart looks great but I agree with Teresa. I think you may have o'd on CD21. I can see a real clear shift there and I would draw your coverline around 97.6.
I think you have a great shot at things because you bd when you had fertile cm and your shift is very clear to me. Hopefully you will get your bfp soon!
Good luck and bunches of baby dust from me!