I know that all women ovulate at different times in their cycle, and it's not strictly between cd14-17 etc. But once you know the rough time you ovulate - is it always the same time every month? I used opk's last cycle and got a strong positive on cd19&20 followed by cramping, but this cycle those days have come and gone and having negative opk's and no symptoms. I'm annoyed because we've been bd'ing the most this cycle so thought we stood a really good chance - but as far as I'm aware I haven't ovulated started opk's on cd10. Feeling meh!!