Rollercoaster- I feel or you, it actually happened to me last year ( missing ovulation) and my FET got cancelled until the next month-I was SHATTERED at the time.

I was doing opks and had a scan but by the time i started opks I think i had ovulated that day. I don't think the scan differentiated between whether the follicle was pre or post ovulation. I kept doing opks but got nothing, the darkest line was the first day I did it ( but it was pretty light) and after a few more days I realised what had happened, had a BT and it was confirmed i had already ovulated- grrrrrrr!!! Partly my fault as i didn't tell the nurses i sometimes ovulate early, so maybe they would have told me to start opks ealier.

Anyway, after that debarcle I now have BTs everyday from cd8 or9 to track ovulation for FETs, sometimes have to have 4 or 5 but its worth it ( and I double check at home with my own opks lol)

I agree, FETs should be easier, not more stress, I really, really hope you haven't missed it. Are they checking your progesterone too with a BT as that would be rising if you have already ovulated. SO frustrating, hope you still catch it hun xx