In terms of additional attempts, it's up to you if you want timing or not. If you do want to keep going with timing, stick with the attempts you've already had. If not, we can add attempts every 2-4 days all cycle long, but keep the 3 attempts in the fertile window in addition.
Yes, the high on CD 12 may have been a false high. Do you ahve an updated chart I can see now?? I'll be able to tell you a lot better at this point. I do think CD 13 is quite likely as there was a dip, there's often a dip the day of O but I can't tell just yet. A newer chart will really help me guide you.