Breaking the News

My BF and I are pregnant. I am due Janurary 1st. It is an unexpected pregnancy. We are 22, go to school, live on our own, and work. We have been going out for many years but our families don't know that because we kept it quiet for a really long time since it was long distance.
My parents met him a few times but they don't really know him since they live across the country. His parents know me a little but I don't speak Spanish so there is a language barrier. I don't think our families would be too excited about our pregnancy because they don't really know us. We know us but they don't know us. How would we break the news? I'm so nervous.