I say have a drink or two, one artificially high temp is probably not going to throw your chart off. FWIW I think you are 2 DPO, your temps CM and OPKs seem to line up, or at least what I can tell from your thumbnail.
I agree with PP that you are probably 2 DPO (maybe 3 DPO). Has this been a stressful month for you already? I ask because your other two months you appear to ovulate around CD 20, and here you're at CD 29. How long have you been off the pill (assuming you were on it before)?
Also, so sorry about your grandparents. T&P for your grandma!