Hi HJ - I can't recall how long I was on the pessaries for, about 3 weeks I think. It was with my last cycle & was to try to achieve pregnancy following transfer. OCP is the Oral Contraceptive Pill - hate it! I agree with TL, just wear a liner & you will be fine. I don't know what the FS will be trying this time....its always a guessing game, I just go with his recommendations for the most part.
Take care!