Belly button stitch came out. Any suggestions? (photos)

I think I may have popped a stitch I went to wipe dry my bb and stitch still tied came out , is this okay to leave it ? Or should I go back to get a new on put in ? Also I have e white drainage coming out my bb I placed a pad there to absorb it , it does not have a smell , and is brown on the pad , does my bb look normal, surgeon says it looks normal but I kind of think it looks infected please help ?haven't told ps about the stitch yet