Do you announce an unplanned pregnancy?

We're not gonna go all out with the cute announcement pictures but I'm just wondering how I should do this. My family and close friends all know already. But I'm only 18, a freshman in college and just started dating my boyfriend like 5 months ago. Soooo obviously this was not planned. 
But I still want to be able to feel excited now that we've come to terms with it. I'm just hesitant to announce it on social media, to my extended family, etc. Should I just post/ send  an ultrasound pic in a few months? I was thinking of waiting until 20 weeks to. I'm currently 11 weeks. 

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