31 weeks pregnant and leaking urine?

So earlier today i was laying on the couch with my daughter, i sneezed and leaked a large amount of urine. Just now i was standing in the kitchen doing absolutely nothing and more came out and leaked down my leg. Anyone else experiencing this? I leak urine often but not this much usually. Im going to see if it happens again before i make a fuss about it. I have an appointment tomorrow too so ill also mention it, just wondering if im the only one!