I was only just 21 and had been with my partner for 4 months when we found out we were expecting. I was freaking out telling both of my parents. Because it was only a few weeks before that my Mum had said she didn't want to be a grandma yet. And my Dad, well what Dad ever wants to hear his 21year old is pregnant? In the end my mum was so excited, Dad took a while to come around - but they are both thrilled with their grandsons.
I like River Song's suggestion!