Mayor Bloomberg’s daughter Georgina is starting to enjoy her first pregnancy with equestrian Ramiro Quintana. “I was very tired during the first few months but have more energy now that I am in my second trimester,” she tells Hamptons magazine. As to whether Georgina will ride in the Hampton Classic — running Aug. 25- Sept. 1 in Bridgehampton — she says it’s still up in the air. “I will just listen to my body and see how I feel as each week passes,” she says. “If I do show, I will just be competing with two or three horses instead of the six or seven I was planning.” She added, “But I will have a few of my horses there competing with other people no matter what, and I will be there to cheer them on.” Georgina was spotted in Manhattan Thursday still looking “very tiny,” having lunch with her father at Rouge Tomate. We’re told the mayor stuck to soup and salad before walking around the room to shake hands. Georgina is due this winter, making Hizzoner a grandpa for the first time.