Announcing 2nd pregnancy?

So I'm visiting my parents this weekend and will be staying at their house a night or too. I was thinking about hanging out announcement photo on the fridge in the middle of the night and see how long it takes them to noticed the next morning. Their fridge has like 6-7 photos on it already so it would kinda blend in. I'm just not sure if this is the kinda way you should tell your parents or if it's a cute idea. Thoughts?
 I guess I should add that I am 22 and married ( husband is 23) and this is our second child together.

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