good advise from Tiff.
some things to think about if it happens again:
does it happen when you need to go to the loo so ie: pelvic floor maybe a little weakier expectably.
does it happen after youve been to the loo when you stand from sitting, or whilst walking?
does it happen if you cough, sneeze, pick up something?
pop a panty liner or pad depending on the leakage and take note of the smell. Sweet smell not unlike seamen could me a rupture of your membranes.
also clearer in colour then the yellowish urine colour
when this happened to me at 32weeks i thought i was just wetting myself but turned out it was amniotic fluid. If so they will want to monitor you because of possible infection.
Not trying to worry you just from my personal opinion and experience