Careful with water exercise - sometimes the resistance you get in the water makes you pay for the efforts later on! It depends on what you're doing in the water and how the pain is presenting. I ended up, in the second pregnancy, avoiding kicking and wearing flippers so that I wouldn't have to move my legs and feet much. Floating is good, though Yoga is great, because you can back off with more awareness of when a movement is pushing your limits too much.