In the OET speaking assessment criteria, have a look at the column for "Fluency" and scoring a Band 6 states that your role-play should show:
•Completely fluent speech at normal speed.
and that
•Any hesitation is appropriate and not a sign of searching for words or structures.
What this means is that it's important that you do pause and that you use pauses effectively in order to aid the flow of the role-play.
You haven't paused because you are searching for the correct word or grammar point in English, but you've paused for effect. Maybe, the patient needs time to take in some information you've given them. Maybe, you are warning them and you are pausing so that they are ready to hear what you have to say. Or maybe, they need time to respond to you and you are giving them the space to do so.
In our latest #OETLearnuary video, we look at how a real GP does this as part of a routine consultation.