Help?

I just found out I’m pregnant last night. I’m excited and scared all at the same time. My boyfriend told his family and they’re all very excited as it’ll be the first grandbaby. I told my best friends and they’re supportive as well. What I need help on is how to tell my family. They’re already plenty children from my siblings so I don’t think they’ll be as thrilled as his family. I feel like they’ll end up being supportive after the initial shock, but I’m not sure how to go about it. I’m the baby of the family (I’m 19) so of course they’ll all be surprised. Any suggestions??