Since coming back from the disabled list and a back problem in mid-May, Andy Pettitte had reduced his between-starts workload to one bullpen workout — until his most recent start, Thursday’s loss to the Rays. “I threw two [bullpen sessions] before the last start and I didn’t realize it while I was talking to you guys the other night,’’ Pettitte said after throwing a bullpen session yesterday morning. Because his back is not an issue, Pettitte will throw another bullpen session today as he prepares for a Wednesday start against the Rangers. “I have always done [two] since it’s been so long since my elbow has given me trouble,’’ Pettitte said. “I am feeling a lot better and my back is fine.’’ Pitching coach Larry Rothschild isn’t bothered by Pettitte’s 5-5 record and 4.20 ERA. Or that the 41-year-old lefty is 1-3 with a 4.75 ERA across his past five outings. “The other night his stuff was good,’’ Rothschild said of Pettitte, who gave up five runs and nine hits in 6 2/3 innings. “I think he is ready to get on a run, I wouldn’t be surprised.’’