[iHEAVENn]

Maybe once the baby is born they'll get over it?
Honestly, I would just tell them if they aren't going to be supportive then they don't need to be in your life or the childs life right now.

My parents were a little shocked when I got pregnant but they got over it and supported me during the pregnancy. I let my mom pick out baby stuff, and let her help with the baby shower. She wanted to be there for the labor, but I told her to stay at work cause I had to be induced and nothing exciting was happening. We eventually called her before it was time to start pushing and she was able to watch her grand son be born. (Which I think helped a lot)
You can always try talking to them and see if they'll cool off now and realize that the baby is coming soon no matter how they feel about it.