Help with ovulation sticks

Hi ladies

So I underwent ivf treatment late last year and got my negative result beginning of November. I have now decided to start tracking my ovulation again so we can try naturally and hope we get a little surprise as we are ‘unexplained fertility’. So I took a test on the 3rd feb faint line so means negative, I then took one yesterday which was a lot darker but still not positive. So I’m now thinking I should be ovulating within the next couple of days, we’ll I took another test today and there’s no line what so ever now ! Have i ovulated or have I not released a egg this month ? I’m hoping it will rise back up 🤞🏻any thoughts ? Much appreciated x Ps excuse the messy numbers I was writing with a pen 😂they are in date order l.