Being a new employee at a meeting where all others present know the pretext of the discussions is difficult. It is awkward to be involved in a situation when you are unprepared or unfamiliar with the topics and definitely do not want to give the impression of being incompetent at your new position. The most important thing you can do is find out when the next meeting will be called and make every effort to learn as much as possible before it occurs. No one expects you to be up to speed on the projects from day one, but it is your responsibility to seek out your team leader and get filled in as soon as possible. Do your homework, consult with colleagues and prepare a list of your questions that a co-worker can answer ahead of time. During the meeting, don’t feel pressured to talk but mainly you should be listening and learning. If you do have questions or comments to offer to demonstrate some familiarity with the project feel free to jump in.