Telling bf’s parents we are pregnant! HELP!

My bf & I haven’t told people we are pregnant yet. I’m about 10wks and we plan on telling them Thursday after the first ultrasound. His stepmother has been making comments that I am not allowed to have a baby yet/that we can’t have that right now. We don’t really fight, but she makes me upset when she says these things. And his dad has expressed he doesn’t want us to have a child yet. I want it to be special when we tell them, but I don’t know how to tell them. I am worried they will reject me/him/the baby cause we aren’t kn their timing. Any suggestions or ideas? (Btw we live on our own/pay our own bills)