I know how ya feel, I got pregnant with my first when I was 19 and I was terrified to tell my parents, in fact, I didn't! I made my sister tell my mom for me so that she could be angry and deal with it, she called me when she calmed down and everything was fine. I made my mom call my dad for the same reason. I know that was the cowardly way to go about it but honestly, I'm glad I did it that way, I didn't need to see my parents cry and be upset with me, I was dealing with enough.
With this pregnancy I am 22 so my son is 2 1/2, I told my mom face to face and it was hard but she was happy for me. I waited until I was 10 weeks to tell my dad, just in case God forbid I lost the baby. I didn't exactly tell him, I used my son lol I had my son walk over to him with my ultrasound picture. It was hard, my dad started crying and so did I, I told him I was sorry and that I didn't want to upset him or make him ashamed of me. He said he loved me and could never be ashamed. BTW, this pregnancy was planned but my family doesn't know that, they would think I was an idiot if they knew.
Anyways, sorry to ramble, my point is that no matter how you tell them it is going to be hard but they will understand and they will eventually be happy and excited to meet their new grandchild.
Good luck and congrats!!
Congratulations. I know this is an exciting and scary time, but it is definitely a blessing. Any parent could possibly be sad/ upset to find out that you are pregnant only because they want the best and easiest life for you. Most parents will adjust to the idea and be excited about being grandparents once the shock wears off. Just remind them that though we make mistakes, God doesn't. Your child has a special place and purpose, and you would like their support, wisdom, and guidance. Good luck, and I hope things go well.