Thoroughly confused

ok, so according to bbt I ovulated on CD 18. I am usually fairly regular at CD 26-which is not a 2ww. However I started spotting cd26-28 (dark brown) and I started my period today.

I know I have several open circles on times, those were taken at 6:00 instead of 6:30.

And my bbt never dropped below coverline when new cycle started

So I guess, I'm just not sure what's going on. Did I really ovulate on cd18 if I didn't have a 2ww between then and start of new cycle??