A study has found that the risk of a heart attack among pregnant women rose 25 percent from 2002 to 2014. The study, published Wednesday by Mayo Clinic Proceedings and led by New York University School of Medicine researchers, found the risk affected women while they were pregnant, giving birth or during the two months after delivery. Women having kids later in life is one possible reason for the increase, and more women have obesity and diabetes, key risk factors, NYU Langone Medical Center officials said.A woman between age 35 and 39 who becomes pregnant is five times more likely to suffer a heart attack than a woman in her 20s, medical center officials said.Heart attacks are also easier to detect due to improved testing, which may explain the rising numbers. Dr. Sripal Bangalore said in a statement that the research helps remind people how stressful pregnancy can be on the body and heart. Doctors advise that women considering pregnancy know their risk factors for heart disease.