My cat has been leaking clear/pinky water for 2 days now,its her 2nd pregnancy, she seems OK in herself and the kittens are lively,she has only just started having small irregular contractions,so do you think I'm right in thinking that she's just taking her time?

Usually they start having kittens within 24 hours of starting labor...

I would seriously consider getting her to a vet if nothing happens soon.
Make an appointment to get her spayed as well.