It's a curious chart, no doubt. But, with 97.6 as a reference(other chart and af temps on this one)for pre-o temps, you only have 2 isolated temps above cover. I don't think you have o'd yet. A few more temps will paint a better picture.
I would also agree with you...but I know my first period after my first m/c my chart was all over the place and my RE said he didn't think I o'ed. Your's looks like you o'ed the 31st. I would just want and see. I know how anxious you are...good luck!!!!
I agree. It does look like you O'd on the 31st...but like you said, it's a bit hard to say for sure, since you didn't temp before then. I hope you did, so that you can get your period and be back on track again :-)