Yellow discharge?

hello, i am female and i normally have white discharge from my vagina, sometimes i had yellow discharge, it isnt bright yellow it is a kind of pale yellow, i dont know if this is normal or if this could he a sign of an STD. I have no other symptoms and i am aware that sometimes symptoms dont show. Anyone let me know thanks!

discharge can sometimes appear yellow when it dries. has there been any changes to the smell? or amounts etc?
unless theres any other symptoms i woudlnt worry too much. but theres no harm in having an std check if youre concerned