No, it is not pink! Any self-respecting student in basic art class knows that the opposite of Blue is YELLOW! The answer is, it's a Yellow note!
If you are in disbelief, try looking intently at something Blue--especially "Primary Blue", then look away at, say, a white wall. You will see a yellow spot in the shape of the Blue item. If you still don't believe it, ask at your local art supply shop. You might even want to take an art class.