To answer your other question about for attempt on CD18, it could have been a viable attempt. If you look at you chart, there wasn't a clear temp shift to indicate ovulation occurred until CD19. I thought your last attempt was on CD16, according to your chart.
I too had delayed ovulation and found through monitoring that despite clear temp shifts on my chart, ovulation was occurring 2-3 days AFTER that. This is why if this cycle is a bust, we should have you continue BDing until a few days after your temp shift. Remember, charting charts your hormones. Hormones can fluctuate much greater than bodily functions. Our hormones can sometimes prepare for a function to occur, but the body carries out the function at a later time.
Hope this makes sense!
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