I had one too, it's a fluid collection. It'll either go away or become infected - just keep an eye on it, if it becomes itchy, red or hot, go to the GP or call your Ob for some antis. I had a repeat course, and once I started, the pus all came out through the skin (eww). But then was much better! Keep your steri strips on your suture line as long as possible, if there's inflammation, it may take a little longer to heal.

Congratulations by the way!