BBT Chart Help!!!

I'm new to charting and I have no idea how to read this... I feel like my temp is all over the place. I missed a day or two pre ovulation since I was away and forgot my thermometer. The huge spike in temp right before ovulation can be attributed to a night of drinking. But other than those anomalies I take my temp around the same time every morning, as soon as I wake up. Any help would be greatly appreciated! (Ovulation was detected with an opk, if that helps at all). Thank you!!!