Orange tint to spit up/sick

This is a new colour for us! Baby is combi fed. No bleeding nipples or cuts in/around his mouth where blood could have mixed with fluid. Tiny patch on his bed too, about 50p size. Would you be concerned by this? My 24hr telephone support ended this week so can’t get any quick answers and don’t want to be a hypochondriac taking him to the GP 🤣