In our study, only 5% of patients had pre-existing urinary problems while the majority had urinary symptoms in the third trimester. Our study reveals the high prevalence of bothersome bladder pain, straining and enuresis in the pregnant women in the third trimester compared to other studies. The high prevalence of these symptoms in this UK. Below we have listed the best exercises for the third trimester of pregnancy and they are: 1. Pelvic floor exercises. In third-trimester pregnancy, pelvic floor exercises can help strengthen your muscles and keep you from leaking urine accidentally. Pelvic floor muscles play a large role in the body’s core, this is also called kegel exercises.