Вакцины от гриппа не только не противопоказаны, но и настоятельно рекомендуют ставить.( с сайта минестерства здравоохранения Онтарио)Pregnant women, especially those in the second and third trimesters, and women up to six weeks after delivery are at a higher risk of developing complications, such as pneumonia, from influenza. Flu shots are safe and recommended for all pregnant women