Mine opened. I had tape on the outside and stitches on the inside.
I went in and the OB packed mine with gauze tape. It wasn't painful but really gross. My dh had to do it I think 2 times a day. ..
It healed quickly.
I think you'll be fine if you keep a gauze pad over it and watch for an increase of puss. A little is normal. After a day or so I started placing a little band aid over the open area.
I wouldn't worry though...mine healed just fine with normal scaring.