Bacteria/safety

Toast

Good morning! This morning I fed my starter after a few days of neglect. I was in a rush since I was also in the middle of making breakfast for my toddler, and after I was done I realized that there had maybe been a small patch of orange on the surface of the starter before I stirred it down. 

I plan to start over just in case, but I kept the starter in question just to see what happens. If there actually was some Serratia/bad growth, would it show up in every subsequent feeding? Or put another way, is there a way to tell if I imagined something vs if there was actually something dangerous? I have OCD and I can see this really easily turning into an “…are you SURE?” type of thing, and I don’t want to throw out every starter I have as soon as I “think” I see something off about it.