I’ve just while performing wudhu before wiping my feet touched by accident with the top of my finger the sink. I don’t really know tho if that tiny little part that I’ve touched my pink with was actually wet (it probably was).

Would this make my wudhu invalid? I’ve prayed already

If there was water on the part you touched and you wiped with it then your wudhu is invalid. If you don’t know then you can proceed as if it did not