If you look at my chart it is just like you are describing. I get the same thing. I usually O on the last day of a positive OPK.
Just BD and don't stress too much over it.... I know easier said than done.
Will your doc be okay with you temping next month? I know for me I would be more stressed not temping than I would be if I was temping. Maybe your doc was just trying to tell you "something" different to do this month?