How do I tell my church family I'm pregnant?

( im on my friends account) Anyway, im 17, and have moved out of my house because of issues with my family, although most people think my house is all good and my parents just let me move out because I wanted to be independent but my parents are totally out of my life. Anyway, my church family is very close to me. Two of the older ladies are my "mamaws" and a lady I call "Nana". Anyway, I'm a good girl, in band, get straight A's and have a full scholarship for academics and have never even kissed a boy. but I was d, coming home from a football game I had been playing my flute for, and I just found out a few days ago I'm pregnant. "Mamaw" phyllis only has two real grandchildren, one is 27 and one is 13, and I always told her I was gonna give her a house full of little grand kids, and she always said yes, someday after your MARRIED and you and your husband decide u want to start a family. So clearly you see how much being married means to her, So how do i tell her and my other "family" members that im pregnant from a . and "Nana" is my band director, so how can I convince her it wasn't her fault.