18 year old pregnant

Caylin • 18 ' mommy to be .
I'm 18 years old & pregnant & a high school graduated & have 2 jobs  & I just don't know how to tell my mom that I'm pregnant I think she will hate me strongly.! I want to continue to hide it & let her find out but it's hard because I'm her baby girl & I know she wants the best for me. 
Help any good ideas to tell moms ?