I'm 30 weeks pregnant.

And my family doesn't know that I am pregnant. I am 30 weeks pregnant, but not showing as much as the other women that I've seen by far. The main reason why I haven't been able to tell them is because I am very afraid of how they will react, and I don't handle rejection well. I'm 20, not married, but I have really traditional parents. My boyfriend and I though have been together close to 3 years. I know I have to tell them soon because today I realized I look a little bigger and my baby bump has started to show. I want to know if you ladies could give me on some advice on how to break the news, or about how you told everyone. I'm about to go on a family trip soon and I am debating whether I should tel them before, during, or after the trip. And did you guys have your partner there when you told your parents about your pregnancy? I'm just so nervous, any advice would be highly appreciated! Thank you!