Your waters can leak out gradually or come all at once. If your baby is down quite low it is possible that bub will block the leakage, this is ok as fas as I know. The best way to tell if they are true contractions or just bh contracions is to have a bath, if they stop then its likely they are just bh if not then congratulations. Oh and have a few more cups or raspberry tea, it won't do any harm. It doesn't actually cause contractions it just makes them more effective.
HTH

Take care
Trish