Fertility appointment follow up

Ch

Yesterday I went to a fertility specialist for the first time. I provided him with a year worth of period and ovulation information. He said my cycles are slightly irregular and that I am “thin” and need to gain body fat. I am thin but am skinny fat. My body fat is t least 20 percent. Now I am being asked to do a pegesterone test and my husband a sperm analysis. I’m not sure if I should race to try to gain weight... I feel extremely healthy... should I just wait for my test results?