I think that there is chance that you ovulated on CD16. You could add OPKs for added info. Good luck.
I started my period today, not next week like I though I would. My temperature today has an X on it instead of a circle. What does that mean?
If you checked "disturbance" on your calendar, the software will mark that temp with an X and not connect it. I think it does that for early/late temps too. If you didn't get much sleep, were traveling, were sick, etc. etc. it can mess with your temps. I would definitely buy your own copy of the book (used is fine) to refer back to. BTW, it took me 14 months for my body to readjust coming off bc. I hope you love FAM, I'll never go on bc again!!
Apply the "rule of thumb" to CD 10, CD14, & CD19 then move your coverline to 97.7. Then you've got O on CD 16 and a 13 day LP. You don't have huge temp shift but if you look closely, it's there. Are you temping at the same time everyday?
Pretty close; 6:15 - 6:30 AM everyday.
I'm impressed by your timing. I'm bad at taking my temp on time, but my temps are really stable so I get away with it. One other thing that helps a lot of people is to switch to tempting vaginally. It's a lot more accurate. Good luck!