Does this BBT chart make sense? (TTC)

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Hi all - I'm quite new to BBT, so hope you can help. My chart doesn't look like the examples I've seen!

It seems most likely that I ovulated around 2 August, as I had an LH surge (+OPK) on 31 July and 1 August; and an NHS progesterone test on 9 August said "indicates ovulation" (43 nmol/L).

But my Femometer app reckons 4 August, despite no sudden rise at that time; and four days after surge?

Here's my chart from the app...

I'm not convinced you've ovulated yet based on the chart - however femometer charts are pretty useless to look at! I'd advise you to populate this into FF as theirs are much easier to interpret from my experience :)

@Juno231 - Yeah, that's what I thought. I will try FF! Thanks :)

Lucky that tests indicate I did ovulate - do you know anything about progesterone levels? The GP said it shows I did ovulate (43 nmol/L). It was done a few days ago, about 7 days after suspected ovulation.

That's good! Yeah anything above 30 indicates ovulation occured.

Looking at your chart again I'd perhaps argue you ovulated on CD17 - would that tie in with the progesterone test?

@Juno231 - Yes, it's technically possible, as I had an LH surge (peak - very dark line) on the morning of CD17. Also on CD18, but I know it's the start of the surge that counts, in terms of ovulating 12-36 hours later. It could have been 12 hours.

The progesterone test was 9 days later - so not the ideal 7 days, but pretty close!

Thanks very much for the expert eyes! :)