advice please

Katherine
My boyfriend and I are super excited to be pregnant and having our first child. As much as my family loves him I'm nervous they are not going to be happy for us. I'm 23 and still have a year left on my masters for teaching and he is 28 and out of school. We both are more than capable and ready to start a family! I'm just nervous about how to announce it to my family. Any ideas? I'm 4 weeks and just found out Friday. Should I wait? Tell them immediately? And how should we announce it?