My first charted cycle was like that - tried to tell me I had O'd on CD 7 or something ridiculous, then 17 (correct) and then later told me not at all. now that I've done it for longer though, I know how to recognise the anomalies and outliers that make it happen, and I find it really handy. Well, I did, when my cycle was normal. It'll come back. Soon enough.
Give it some time, the first one might just be rubbish, or a bit of a learning curve.
It took me a while to get the hang of charting. At first I didn't realise how important consistent timing was, etc. I also started off originally with a mercury thermometer...
After 2 years of it, I now have a much better idea of when to accept or reject FF's interpretation. For example, this cycle it tried to tell me I O'd on CD12, which I knew was complete rot because I know my post-O temps are over 36.5. Once I actually had 3 temps over 36.5 it shifted my O day to CD16 (which I agree with).
Hopefully you'll get your BFP before you have time to become an expert on charting!
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