@BabynameEdie so I have to get to grips with different style charts. Is the dotted line a previous cycle? Cos I'd say you haven't ovulated yet. If the hearts up too are BD then keep up the good work cos O should be coming.
@Boboelephant I think keep doing opks. Like @Claire138 said fallback rise is oestrogen and progesterone fighting. MCs do mess up cycles but equally you know your body best. So keep DTD and assess again in a couple of days. I always assume I haven't ovulated until it's 100% obvious.
Also any ladies who are charting... if you use fertility friend (the app) it tells you when you e ovulated. You can do the free app or you can pay £30ish a year and it tells you all kind of stuff... like a pregnancy monitor. It's really cool and takes some of the guess work out of it. I've attached the pregnancy monitor page... tells me so much