Hi Indy - welcome to Belly Belly. I am sorry for your loss...

Cycles can vary and it is not at all unusual to have the odd wierd one thrown in here and there. However, I know only too well just how frustrating that can be when TTC.
I have always found ovulation sticks a really good way of knowing when your LH surge is and thus the best time to TTC. I too encoutered similar to you along my journey. Sometimes I found I needed to test twice daily - sometimes I found that I surged later in my cycle and other times earlier.

Keep testing your LH surge may be yet to happen or alternatively you may not ovulate this cycle at all - again this is normal now and then in the picture of "healthy reproduction".

Wishing you well on your TTC journey...