Chicken Little I hear you!! I have the exact same problem and it drives me crazy! (and im a few weeks behind you)..Sometimes I feel soooo busting so I go, then I do the tinniest little wee. Then a few mins later- the same happens again
Occassionally I can get bub to move positions and then normally it's an instant fix, and I don't need to go anymore. But when he or she stays down low, it's terrible! Today I was complaining to DH about it and he said 'gee im so sick of this weeing thing' ...i was in shock and said YOU'RE SICK OF IT??! PLEASE!
I also get a bit of leakage with the sneezing and I haven't had any babies yet Just praying pelvic floor exercises will work miracles for me!

Anyway, i sympathise completely with you...