Haven't told his parents.

So my BF hasn't told his parents that we are having a baby girl, but m 14 weeks. This baby was a big surprise birth control failed. He's scared of what his mom will say. But we are well in our 30s I have my own place and we both have good jobs. Should I just show up at his parents house and tell them? He said he would hate me if I did but I don't want them to find out by someone else.