Incision opening

Ka

My incision has been healing well (2 weeks pp) and at my follow up on Tuesday Dr. said all looks well. But I looked at it today and it’s got a small opening towards the center. It’s not bleeding. Doesn’t really hurt (but i haven’t messed with it or worn anything bothersome for it). Has this happened to anyone? What did you do or what did the doctor tell you to do?