The drugs from the shots and pills can cause the cysts. I ended up with them after the clomid and never had cysts in my life before. Since it is just hanging out with the other ones, I wouldn't be concerned at all!
What size are the other 4 follies? I ask because it sounds like you may end up with 1 dominate one like I did. If so, they need to focus on that one. What happened with my IUI cycle is I had 1 follie that was at a 21 size and the other 3 11's. They were waiting for the little ones to catch up and it didn't happen - the 21 follie got too big and I think it ended up bursting.
Sorry for babbling so much, I am super excited for you!!!